Yes I am sure it the shock....My tires are right at the lip of the fender, 275/60 R15 as wide as I could get. It on the passenger side, which always seems to sit closer to the body than the driver side.
Chryco, I will contact Edlebrock. You are right they have less then 10,000 miles on them. However, they or anyone else list them as available right now. So even if they warrant it...they cant replace it.