I talked to Paul at Lord today. Here's what he recommends:
I'd suggest using our J-3804-28 mounts for the IO-540 engine with the small ears, (4) kits per engine. This kit includes our "LM damper" silicone-filled spacer to reduce motion at start-up and shut-down.
Built RV-4, RV-6, 2-RV-10's, RV-7A, RV-8, Prescott Pusher, Kitfox Model II, Kitfox Speedster, Kitfox 7 Super Sport, Just Superstol, DAR, A&P/IA, EAA Tech Counselor/Flight Advisor, CFII-ASMEL/ASES
Kitplanes "Unairworthy" monthly feature
EAA Sport Aviation "Checkpoints" column
EAA Homebuilt Council Chair/member EAA BOD
Author "Pre-Buy Guide for Amateur-Built Aircraft"