diff --git a/scss/_variables.scss b/scss/_variables.scss
index bef7c3841029..c0355bbe414b 100644
--- a/scss/_variables.scss
+++ b/scss/_variables.scss
@@ -232,8 +232,8 @@ $enable-important-utilities:  true !default;
 $spacer: 1rem !default;
 $spacers: (
   0: 0,
-  1: $spacer * .25,
-  2: $spacer * .5,
+  1: $spacer / 4,
+  2: $spacer / 2,
   3: $spacer,
   4: $spacer * 1.5,
   5: $spacer * 3,
@@ -916,8 +916,8 @@ $dropdown-link-active-bg:           $component-active-bg !default;
 
 $dropdown-link-disabled-color:      $gray-600 !default;
 
-$dropdown-item-padding-y:           .25rem !default;
-$dropdown-item-padding-x:           1.5rem !default;
+$dropdown-item-padding-y:           $spacer / 4 !default;
+$dropdown-item-padding-x:           $spacer !default;
 
 $dropdown-header-color:             $gray-600 !default;
 $dropdown-header-padding:           $dropdown-padding-y $dropdown-item-padding-x !default;
@@ -957,22 +957,22 @@ $pagination-disabled-border-color:  $gray-300 !default;
 
 // Cards
 
-$card-spacer-y:                     1.25rem !default;
-$card-spacer-x:                     1.25rem !default;
-$card-title-spacer-y:               .75rem !default;
+$card-spacer-y:                     $spacer !default;
+$card-spacer-x:                     $spacer !default;
+$card-title-spacer-y:               $spacer / 2 !default;
 $card-border-width:                 $border-width !default;
 $card-border-radius:                $border-radius !default;
 $card-border-color:                 rgba($black, .125) !default;
 $card-inner-border-radius:          subtract($card-border-radius, $card-border-width) !default;
-$card-cap-padding-y:                .75rem !default;
-$card-cap-padding-x:                1.25rem !default;
+$card-cap-padding-y:                $card-spacer-y / 2 !default;
+$card-cap-padding-x:                $card-spacer-x !default;
 $card-cap-bg:                       rgba($black, .03) !default;
 $card-cap-color:                    null !default;
 $card-height:                       null !default;
 $card-color:                        null !default;
 $card-bg:                           $white !default;
 
-$card-img-overlay-padding:          1.25rem !default;
+$card-img-overlay-padding:          $spacer !default;
 
 $card-group-margin:                 $grid-gutter-width / 2 !default;
 
@@ -985,8 +985,8 @@ $tooltip-color:                     $white !default;
 $tooltip-bg:                        $black !default;
 $tooltip-border-radius:             $border-radius !default;
 $tooltip-opacity:                   .9 !default;
-$tooltip-padding-y:                 .25rem !default;
-$tooltip-padding-x:                 .5rem !default;
+$tooltip-padding-y:                 $spacer / 4 !default;
+$tooltip-padding-x:                 $spacer / 2 !default;
 $tooltip-margin:                    0 !default;
 
 $tooltip-arrow-width:               .8rem !default;
@@ -1016,11 +1016,11 @@ $popover-box-shadow:                $box-shadow !default;
 $popover-header-bg:                 darken($popover-bg, 3%) !default;
 $popover-header-color:              $headings-color !default;
 $popover-header-padding-y:          .5rem !default;
-$popover-header-padding-x:          .75rem !default;
+$popover-header-padding-x:          $spacer !default;
 
 $popover-body-color:                $body-color !default;
-$popover-body-padding-y:            $popover-header-padding-y !default;
-$popover-body-padding-x:            $popover-header-padding-x !default;
+$popover-body-padding-y:            $spacer !default;
+$popover-body-padding-x:            $spacer !default;
 
 $popover-arrow-width:               1rem !default;
 $popover-arrow-height:              .5rem !default;
@@ -1060,7 +1060,7 @@ $badge-border-radius:               $border-radius !default;
 // Modals
 
 // Padding applied to the modal body
-$modal-inner-padding:               1rem !default;
+$modal-inner-padding:               $spacer !default;
 
 // Margin between elements in footer, must be lower than or equal to 2 * $modal-inner-padding
 $modal-footer-margin-between:       .5rem !default;
@@ -1085,8 +1085,8 @@ $modal-header-border-color:         $border-color !default;
 $modal-footer-border-color:         $modal-header-border-color !default;
 $modal-header-border-width:         $modal-content-border-width !default;
 $modal-footer-border-width:         $modal-header-border-width !default;
-$modal-header-padding-y:            1rem !default;
-$modal-header-padding-x:            1rem !default;
+$modal-header-padding-y:            $modal-inner-padding !default;
+$modal-header-padding-x:            $modal-inner-padding !default;
 $modal-header-padding:              $modal-header-padding-y $modal-header-padding-x !default; // Keep this for backwards compatibility
 
 $modal-sm:                          300px !default;
@@ -1104,8 +1104,8 @@ $modal-scale-transform:             scale(1.02) !default;
 //
 // Define alert colors, border radius, and padding.
 
-$alert-padding-y:                   .75rem !default;
-$alert-padding-x:                   1.25rem !default;
+$alert-padding-y:                   $spacer !default;
+$alert-padding-x:                   $spacer !default;
 $alert-margin-bottom:               1rem !default;
 $alert-border-radius:               $border-radius !default;
 $alert-link-font-weight:            $font-weight-bold !default;
@@ -1137,8 +1137,8 @@ $list-group-border-color:           rgba($black, .125) !default;
 $list-group-border-width:           $border-width !default;
 $list-group-border-radius:          $border-radius !default;
 
-$list-group-item-padding-y:         .75rem !default;
-$list-group-item-padding-x:         1.25rem !default;
+$list-group-item-padding-y:         $spacer / 2 !default;
+$list-group-item-padding-x:         $spacer !default;
 $list-group-item-bg-level:          -9 !default;
 $list-group-item-color-level:       6 !default;
 
@@ -1176,21 +1176,16 @@ $figure-caption-color:              $gray-600 !default;
 // Breadcrumbs
 
 $breadcrumb-font-size:              null !default;
-
-$breadcrumb-padding-y:              .75rem !default;
-$breadcrumb-padding-x:              1rem !default;
+$breadcrumb-padding-y:              $spacer / 2 !default;
+$breadcrumb-padding-x:              $spacer !default;
 $breadcrumb-item-padding-x:         .5rem !default;
-
 $breadcrumb-margin-bottom:          1rem !default;
-
 $breadcrumb-bg:                     $gray-200 !default;
 $breadcrumb-divider-color:          $gray-600 !default;
 $breadcrumb-active-color:           $gray-600 !default;
 $breadcrumb-divider:                quote("/") !default;
-
 $breadcrumb-border-radius:          $border-radius !default;
 
-
 // Carousel
 
 $carousel-control-color:             $white !default;
diff --git a/site/assets/scss/_subnav.scss b/site/assets/scss/_subnav.scss
index 4bb27fdda190..fac919e22f27 100644
--- a/site/assets/scss/_subnav.scss
+++ b/site/assets/scss/_subnav.scss
@@ -15,7 +15,7 @@
     font-weight: 600;
     background-image: escape-svg($dropdown-active-icon);
     background-repeat: no-repeat;
-    background-position: .4rem .6rem;
+    background-position: right $dropdown-item-padding-x top .6rem;
     background-size: .75rem .75rem;
   }
 
diff --git a/site/content/docs/4.3/migration.md b/site/content/docs/4.3/migration.md
index 44c0421bceeb..1fc4c7027f62 100644
--- a/site/content/docs/4.3/migration.md
+++ b/site/content/docs/4.3/migration.md
@@ -125,6 +125,8 @@ Changes to Reboot, typography, tables, and more.
 
 ## Components
 
+- Unified `padding` values for alerts, breadcrumbs, cards, dropdowns, list groups, modals, popovers, and tooltips to be based on our `$spacer` variable. [See #30564](https://github.com/twbs/bootstrap/pull/30564).
+
 ### Disabled states
 
 - Disabled states of the buttons, close button, pagination link & form range now have `pointer-events: none` added. This simplifies our codebase and makes it easier to override active states in CSS. [#29296](https://github.com/twbs/bootstrap/pull/29296).