This Rear Muffler Exhaust Clamp is a reproduction of the originals and fits 1957-1976 Harley-Davidson FX and Sportster XL model motorcycles. This motorcycle exhaust clamp attaches 2.5" OD mufflers to support brackets. The perfect replacement for H-D OEM part 65279-57. The Gasbox exhaust clamps are made here in the USA and true to the originals found on vintage Harley-Davidsons. Available in Stainless Steel. These USA-made exhaust clamps are perfect for restoring your vintage Harley-Davidson to it's original condition.