First - STOP apologizing, there is no need.

That could be called a "break away plate". Usually that is mounted to bearers that extend back through the firewall. Probably like in the Skylark. Then the Ply bolts/screws to that and the engine attaches to the plate. Do the plans show bearers ONLY forward of the firewall? I'm doubting it. Either mounting method would work but I would prefer the bearers to go though the firewall for the plate method. Check the plans carefully.

Normal purchase sequence I use is:
Get engine
Determine mounting method and obtain correct mount if needed
Install mount

By buying your mount first, you can't even be sure it would fit the engine you choose. Not all engines of a given displacement have the same mounting dimensions.

Z-bends, L-bends w/keepers, EZ connectors is the order of preference. L-bends are easy and can be done with these to retain them:
http://www2.towerhobbies.com/cgi-bin...?&I=LXAZC3&P=7

Many people frown/hate these:
http://www2.towerhobbies.com/cgi-bin...4&I=LXE114&P=K
but in non-critical places (throttle) they are nice.


BTW - Sand outside