So I am in need of a 261 muffler and see that the 291 has the same flange gasket. My question is will the 291 muffler will fit on my 261. Hard to tell from pics but looks the same without the ears for the bottom. Since its so hard to get mufflers for the 261 unless you buy a new one from the dealer I thought this might be a good work around since 271/291 mufflers seem to be plentiful. Anyone have both they can swap and try out?