On the G75 the muffler bolts go all the way through the exhaust stack of the engine (from the side opposite of the muffler) and through the muffler exhaust stack with a nut on the end.

On the S75 and S75K the muffler bolts go from the muffler side into threaded holes in the exhaust stack of the engine.

You should be able to use the other kind with a little effort.

Enjoy,

Jim