If you're using the Georgia State Patrol Mod by Space816, I've created a GSP vest to go along with it so you can also use your traffic vest in game.
To install the Georgia license plate skin:
1) Open resources.assets with unity bundle extractor and replace Cop002_M_01-mat-_MainTex-atlas0_Vest-1 with this file.
1) Make sure to ONLY edit Texture files.
2) This mod is just for the traffic vest. For the full experience, also download Georgia State Patrol Mod by Space816 to get the main outfit as well. To use his mod, simply replace "Cop002_M_01-mat-_MainTex-atlas0" in resources.assets using unity bundle extractor with his mod "GSP Cop002".