The 3 Tuning parts Are:

[*] Sentinel Air scoop on Bonnet
[*] Sentinel Windscreen Vents on back Windscreen
[*] GTA SA Turismo Spoiler (Imported en Converted)

Features:

[*] You can choose which parts you add using vehicle selector or another trainer,
[*] The Tuning parts spawn randomly on any Comet you see on the street,
[*] Spoiler and Vents can fall of in collisions,
[*] They can all be damaged (bullet holes, scratches, dents),
[*] Air scoop opens with the normal bonnet.

Known bugs:
Nothing at the moment

Video:


I had some work on this, simply because I didn't know all of the features of Zmodeler. 
Thanx to Chasez and KingBullet for helping me out with the largest problem I had.