Extra wheel installation instructions:
NOTE: if you're replacing wheel_gn4, the XXX in this tutorial is gn4 !!!!

- Open gta3.img.  (gtasa/models)
- Find wheel_XXX.dff and extract it (backup) and then delete it
- Add wheel_XXX.dff and ywheel.txd
  (the ones that came in the zip)
- Rebuild archive and after that close IMG Tool.
- Open veh_mods.ide (gtasa/data/maps/veh_mods)
- Find the line of the wheel you're replacing:
  (the first item on the line is the id number of the wheel,
   for example for wheel_gn3 it's 1096.  Don't change that number!!)
  10XX, wheel_XXX, vehicle, 100, 2097152
- Replace the word vehicle with wheel_XXX so that
  the new line looks something like this:
  10XX, wheel_XXX, wheel_XXX, 100, 2097152

Done!!  :)