as 67Sally said, plenty of places to take your $
Global West makes ford stuff, but the big player in the ford market is TCP:
http://www.totalcontrolproducts.com/
if you want to go hard-core, Griggs is the big player (vintage + modern):
http://www.griggsracing.com/
Martz has some great looking examples online too:
http://www.martzchassis.net/
here are some example mustang sites:
http://www.kkpony.com/
http://www.65yellowmustang.com/
http://www.gt350clone.com/
finally, not every PT ford is a mustang:
http://www.cs.odu.edu/~mln/fairlane/
;-)