I have an IO-540 with the large hole mounting ears, but need the small hole mounting ears for my RV-10. I'm wondering if any Rocket builders out there need to trade. The engine my ears are on is 400 hrs. TT with no damage history. email aturner at clarion.edu
There happens to be a set on the fleabay right now. I have Lycoming set as a search notifying me when anything gets listed with Lycoming in it. Or you could do what I did and buy the nice machined billet aluminum ones from Aero-in-stock.