[COLOR=#0000FF]I found this wheel i am going to try and find out what the offset should be if any of you have delt with 20's on the 05' mustang.

 

20's will fit fine. Virtually every car at SEMA had 20's that I was aware of. Saleen makes them standard. 3D Carbon even had 22's at SEMA.

The diameter has nothing to do with offset. Offset is about width.

 

I know i need to find out what offset is used for 20X8.5" or 9"

 

Go to this link to get the offset's available on that rim

http://www.bigwheels.net/wheel_view.jsp?mo...odel=Z11%20Kahn

 

ET 45. Like on all 05 wheels. Their data sheet states they have ET 42 available, which will do as well. I can't really make out which partnumber you need as the indication of boltpatterns is unclear. It should be 5x114.3. Hope this helps.

Btw, they look remarkably like the new Brock B15's:

 

Anybody have any info of those 20 inch Saleen wheels??......

 

3750...