Hoping someone on the Forum has some details they can share on an older tail light upgrade kit install. Bought this some years back and now looking to complete the wiring. Any information welcome. The wires are marked but no details on how to integrate them with the plugs.

 

These snippets from 1999 JTIS should help you cross-reference the wiring on the plug to the relevant lamps:




I'm not sure if there is an equivalent matching socket. If you do resort to cutting off the plugs to splice the connections, consider leaving enough wire length with the plugs to allow their refitting in the event you wish to revert to stock in the future.