Source: 2007 Q3 Beartracks, Bob Barrows
Engine Rubber Mount Assemblies – for use with Bearhawk Kit supplied engine mounts – Bob.
Engine – Lyc. O-540 Type II mount hole dia. 2.00 in bracket
Barry #94110-02 Lord #J-9613-12
Engine – Lyc O-540 Type I mount hole dia. 1 3/8 in bracket
Barry #94110-01 Lord #J-3804-20
Engine – Lyc O-320 / O-360 Type I mount hole dia. 1 3/8
Barry #94011-20 Lord #J-7402-24
Engine – Cont. O-470 1 3/8 Engine mount hole dia.
Barry #94110-40 Lord #J-6545-1
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More information from the KBM: O-320/360’s use the Type I mount. Measure the “cups” that are welded to the engine mount. If the cups in the engine mount are around 2-5/8 inches in diameter, you’ll want Lord J-7402-16 or Aircraft Spruce P/N 08-03600 if you can get them.
Larger cups use Barry 94011-20 or Lord J7402-24 isolators.
Builder Ivan H. did some research and found the following about the Lord 7402-24 vs the 7402-16:
I spoke with a Lord engineer again today. The gel filled spacers are designed to prevent metal to metal contact between the spacer and the inner portion of the dynofocal mount ring during start up and shutdown. That is when the engine experiences the most twisting in its mount. He also said that if a person wanted to save a few bucks, the gel filled ones are only needed on the upper left and lower right locations (as viewed from the cockpit in a front engined plane) to get the same protection. So if one is concerned about that sort of thing, get the Lord J-7402-24’s for those locations and the J-7402-16’s for the other two locations. They have the same stiffness He did acknowledge that many installations don’t need that protection, but couldn’t comment on the Patrol due to no engineering data.