ok so i have seen 1 350Z body kit on a video and some others on other videos (forgot cars) but i want to know where the heck do you get them!!

im getting an RX8 HPI body and i want to get a body kit, i know how to get spoilers but nothing else, anybody know where to get?

i think you are looking at the yokomo 350z. the kits come on the mold unless you make em.

Would a plastic hobby model that was 1/10 and had the right dimensions work so long as you don't wreck?

As for wide bodies and other custom bodies, its just that completely custom. People usually take a second body and cut the fenders or a window or something to make a custom wide body or custom over fenders.