Add following manually in shoppings.dat file:
To section prices - section CarMods:
		bnt_a_ft		FTXBNT		respect 0 	sexy 0		600
		fbmp_a_ft		FTXAFF		respect 0 	sexy 0		990
		fbmp_c_ft		FTXCFF		respect 0 	sexy 0		990
		rbmp_a_ft		FTXARF		respect 0 	sexy 0		990
		rbmp_c_ft		FTXCRF   	respect 0 	sexy 0		990
		rf_a_ft			BMBRS		respect 0 	sexy 0		190
		misc_b_a_ft		FTXSST		respect 0 	sexy 0		100
		misc_c_a_ft		FTXAIC		respect 0 	sexy 0		300
		misc_c_c_ft		FTXCIC		respect 0 	sexy 0		270
		spl_a_cl_b  		FTXASP		respect 0 	sexy 0		900
		spl_c_cl_b  		FTXCSP		respect 0 	sexy 0		700
		wg_l_a_ft		BMWNG1		respect 0 	sexy 0		500

To section shops - section carmod1 (to make them appear in the mod shops):
		item bnt_a_ft
		item fbmp_a_ft
		item fbmp_c_ft
		item rbmp_a_ft
		item rbmp_c_ft
		item rf_a_ft
		item misc_b_a_ft
		item misc_c_a_ft
		item misc_c_c_ft
		item spl_a_ft_b
		item spl_c_ft_b
		item wg_l_a_ft

Add following in gta.dat file:
IDE DATA\MAPS\veh_mods\futogtxparts.ide

If you want to use the parts, replace string starting with blistac with this:
blistac, bnt_a_ft, fbmp_a_ft, fbmp_c_ft, misc_b_a_ft, misc_c_a_ft, misc_c_c_ft, nto_b_l, nto_b_s, nto_b_tw, rbmp_a_ft, rbmp_c_ft, rf_a_ft, spl_a_ft_b, spl_c_ft_b, wg_l_a_ft

If you want to use those as addon, change blistac to futogtx or any desired name.