ron67fb

As far as width goes the rear should be OK, but 20" tall I'm not sure. Might hit the inner wheelhouse? For the front 8" is the generally accepted absolute max, any wider you either hit the control arm or the tire hits the fender.

Here are some threads to keep you busy for a while:
http://www.stangnet.com/mustang-forums/608459-will-18-x-9s-fit-up-front-67-stang.html

1969 Mustang Supersite Web Forums - View Single Post - It's done!

http://www.stangnet.com/mustang-forums/649588-68-coupe-just-finished-2.html

http://www.stangnet.com/mustang-forums/609485-uca-question.html#post5850630

Hi i need your help .

i want 20X8.5 on my 68 v8 conv.

the backspacing on the front is 4.5 rear and rear i think is 5.5

do you think is ok

sorry for my bad english ...

thanks

David