The 45 has the same crankcase as the 40 and the Enya parts list shows the same gasket used on both the 45 and SS40. The prop driver won't be interchangeable though because of plain bearing/ball raced. The 45's prop driver is P/No 45B10 from Enya and is the same as used on the 40. As best I recall (without taking the head off
) there's no shim under the head.
Here's the [link=http://enya-engine.com/P_list/P_list452_E.html]parts list[/link] for the 45 model 6002.