Folks:
Used these to attach rubber to metal:

http://67-72chevytrucks.com/vboard/showthread.php?p=4310757#post4310757

Then had to drill out metal strips to 3/8" (they were slightly undersized), then used well nuts to attach to fender:

http://www.grainger.com/Grainger/Well-Nut-6AJU9

Well nuts are made for attaching two pieces of sheet metal. They have a 3/8" OD and use a 10/32" machine screw to tighten them in place. I couldn't find anyone that stocks the original pinch clips any longer. Gives strips a nice rubber mount.
Regards,
Steve
New Orleans