Thanks for downloading.

Installation:
Replace idaho.dff in the gta3/models/gta3.img with the idaho.dff in this archive, using IMGTool.
Then find a line in gta3/data/carcols.dat that starts with "idaho" and replace it with this line:

idaho, 1,71, 23,80, 39,84, 45,78, 61,79, 59,83 , 14,80, 38,38