Are your exhaust grommets melting?? Blue "Snapper" Grommets-High Temp Silicone-these hold up better and are have the best heat resistance that we have found!!! Designed to fit around a strap with a 5/8" through hole, and use a 3/8" through bolt. 1 1/8" od, 7/8" thick. Works great for isolating exhaust vibration from mounting bolts when attached exhaust system to hangers and frame.