There is another company in the USA who manufacture heavy duty stainless steel U bolt exhaust clamps but they don not manufacture 2.1/8" they make everyother size but that one.

They are called "JEGGS"

Try www.jeggs.com

Morgan 2009 Roadster Rolls Royce Lush Green 3.0 V6
Audi A4 Advant (some blue colour not botherd)