hi rob - am rebuilding 55 t-100 - SAW A 74 ? T120R YESTERDAY THAT IS GOING INTO AN OILY TR6R FRAME - HARD TO SAY WHETHER THAT HELPS YOU - IT LOOKED LIKE THE SHOT ON THIS WEBSITE HAVE YOU LOOKED AT IT ? THIS ONE IS MOSTLY IN BITS - BUT HAS NO TACHO - ALL LATER BONNIES HAVE A TACHO I THINK - MUFFLERS ARE TAPERED CONE SHAPE - J.C.