RedRoadster

I did search, and found at least one; Impex says there are at least 4 different numbers. They could not comment on possible differences, and the suckers are non-returnable. Does anyone know if there are serious differences in this part from year to year - like which hoses connect, and where, or is it just a part numerology thing?

Since I do not have a 225 and am looking for a manifold for an intercooler upgrade, I'd like to know the differences so I can figure which is best for my app.

Thanks for any help.