[AIped]

some mod saving systems usually use the following

GetVehicleComponentInSlot
GetVehicleComponentInSlot
OnEnterExitModShop(playerid, enterexit, interiorid)
OnVehicleMod(playerid,vehicleid,componentid) (doesnt work with addvehiclecomponent, so thats for ingame mod shops only.

publicOnVehiclePaintjob(playerid, vehicleid, paintjobid)
OnVehicleRespray(playerid, vehicleid, color1, color2)

I suggest to check them all out in the wiki and have fun

Edit: Listen to Voxel and check the public/callbacks too