on the Ford Racing website:

"Note: For vehicles with 16" wheels from the factory: -installing 17" x 8" wheels, use steering stop 4R3Z-3932-BA -Installing 18" x 8.5" or 18" x 9.5" wheels, use steering stop 6R3Z-3932-CA
For vehicles with 17" wheels from the factory: -installing 18" x 8.5" or 18" x 9.5" wheels, use steering stop 6R3Z-3932-CA"

Is this necessary? Anyone have problems with wheels hitting when doing full lock turning?

 

See here: http://forums.bradbarnett.net/showthread.php?t=60372

No one is having issues with rubbing. Still trying to figure out why Ford states that they're needed.

 

Thanks. You have the wheels that I want to use so if they aren't hitting on yours I should fine too. I see your tires are the same size as the GT 500 fronts. Do they fit the rim "right"? On the GT500 they look like they are a little narrower than the rim, "pulled tight" if you know what I mean. Could you post some pics of your tire/wheel setup?

 

Here are a couple of threads with some pics:

http://forums.bradbarnett.net/showthread.php?t=60489

http://forums.bradbarnett.net/showthread.php?t=61131 (see pages 1 and 3 of this thread)