will fit with no problems, as long as you aren't going smaller in size...ie have a cobra and want 15" rims....but I can't see anyone wanting that anyway..
Yes they interchange fine. I have a set of DR's mounted on '97CObra rims. The '97 Cobra rims are on my '88 5.0 which has a 5-lug conversion. Last time i went to the track i took the back two wheels off and put them on my 2003 GT. How's that for wheel interchange