ORIGINAL: KeithjV
Can you post a picture of your engine?
You will need a two piece engine mount and a pilot shaft depending on which version of the OS you get.
I used the two piece HPI motor mounts (#86045) and the pilot shaft (#A805) for my install. I have the OS .18 CV-RX 11J rotary carb (#11880).
I am off to work, but I will definitely post pics tonight.