lawnmowertech37
Addicted to ArboristSite
It might be all of the extra "ports" in the air filter cover.
I had "won" a set of 55123 rings from Fayetteville Equipment a little over a month or 2 ago on flea bay. The box looked pretty beat up in the auction picture. When the rings arrived, I had found that someone had put a set of of used rings in the envelopes in what was left of the original Mac box. They were nice & shiny, looked like they had been chrome plated. Tried to get another set from Bill. He said he didn't have any more & he refunded my money once I sent the rings back to him. I would be curious if he happened to find another set now.
If you can't find 55123 rings, you might check into a set of 55124 rings. Those are .010 over sized. You might have to file the ends down, but that is easier than going the opposite way.
how much do they sell for ?