https://github.com/ThirteenAG/PCSX2PluginInjector#using
If you're not sure which version to download, click here.
List of some compatible plugins:
CLEO Library
Burnout 3: Takedown Widescreen Fix
GTA Vice City Stories Widescreen Fix
GTA Liberty City Stories Widescreen Fix
Splinter Cell Double Agent Widescreen Fix
True Crime New York City Widescreen Fix
MKDHook (Mortal Kombat Deception)