Up for sale is a Bison inverter muffler. Part number 6563. Will fit a Fuji 64 or any other enginewith 43 mm between center to center of mounting bolts. Please see the Bison site for more details. Specs 3 1/2 w. 1 1/2 d. 5 1/2 L. flange 3/8". New from Bison $86. I will add 4% for paypal charges unless you tell me that you are paying by money order or bank check.