17x11's?
 

Will 11 inch wide wheels fit on the back of a convertible camaro? I've herd that they won't.

From what I have heard they will fit. Plenty of reputable people have said there is no difference in the wheel well dimensions in regards to a ttop, hardtop, and convertible fbody(93-97) - (98-02). Some people have to pound a little on the inner rear fender well, some don't; others roll the rear fender lip and some also use spacers. It all depends on the offset you choose to go with.

Yes they will fit.

Here's a link to mine. I thinks you need either a 50mm or 53mm.
http://www.sonicbluesvt.com/MikeSS/index.html

Ok but will 18X10.5 Z06 wheels fit?

they'll fit the rear and the front ;)
pix in the signature.
18x10.5 will also fit on all corners... here is someone with a vert and 18x10.5 on all 4 and really lowered the car a lot.
http://www3.telus.net/acarnut/z06_wheels.htm