(center to center = 35.05mm/1.380") O.S. .21-.32, .25FX, .32SX, .25-.36AX (does not fit the OS.25 FP or LA see #6300) (also does not fit the ASP.28 / c-t-c 34mm?) Evolution .36 NT Enya .21 CX, SS, 35X-TN & 35XS GMS 2000 .25-.32 ABC Irvine .25 & .36 (bolt through) Jett .25-.35 Magnum XLS.25 & .25 Pro (I'm told this muffler wont fit the Magnum .28) Thunder Tiger .25 & .36 Pro Webra .25-.36 Speed MDS .28-.38 FS Pro (screws 5/40 x 1 1/4" socket head)