Does the exhaust pipe on a Ford Excort 1994 have some sort of a metal ring, right where is clamped to the muffler? The inlet pipe into the muffler rusted out and broke off. So did the clamp. Now there is a metal ring left on the exhaust pipe, and I don't know if it is just remnants from the rusted out muffler inlet that I pried out. I need to change the muffler, and get a new clamp. What size clamp should I get? Thank you in advance!!