All the ST 40 mufflers up , are pretty much a fit .
The ' gap ' between the flanges - over & under the exhaust stack varies .
judicious care clamping in a vice & opening / widening to suit the G-60
is the go .
Do one side & get it even , half the differance . Then the other .
You need a file that cuts at the end - so it doesnt end bowed / bananaed .
We figure this is the one youre after ??
The END CAPS interchange , anyhow .
got a few , dunno if the fit is G 60 or not . Nothing to opening to fit the stack , tho .