gtasa/data/handling.cfg
STAFFORD     1700.0    3100.0   2.7    0.0 0.3 -0.15 85 0.78 0.85 0.5       5 205.0 24.0 6.0  4 P   11.0   0.52 0 35.0   1.0  0.18  0.0   0.28 -0.10 0.5  0.3        0.16 0.70 100000   40000004	4			1  1	1

gtasa/data/vehicles.ide
580, 	stafford, 	stafford, 	car, 		STAFFORD, 	STAFFRD, 	null,	richfamily,		4, 	0,	0,		-1, 0.78, 0.78,		0

gtasa/data/carmods.dat
stafford, nto_b_l, nto_b_s, nto_b_tw

gtasa/data/carcols.dat
stafford, 3,1,0,1, 3,0,0,11, 2,2,0,1, 13,13,0,11, 118,118,0,1, 112,112,0,11, 1,1,0,1, 46,1,0,11

get that mod car colors make your game more cool ;)
http://www.gtainside.com/en/sanandreas/mods/86342-car-colors-mod/