First model with muffler mounting holes top and bottom.

We do not have a muffler available for this anymore.

Muffler was retained by long bolts that went through horizontal “ears” cast at the base of the stack. For a while, the tapped vertical bosses were retained so an old style muffler could be used on a new engine or visa versa. These horizontal ears were very fragile and could be damaged or cracked off by over-tightening or surely in a crash.

This muffler has the alignment tabs as shown above.