Slant 6 cylinder Aluminium engine

I would contact Kanter, Directly. They list two different part numbers for the aluminum engine gasket sets.
12264J, 60-69 170 engine
12408P, 60-83 225 engine

I have no idea what they are talking about. There was no 170 aluminum engine produced, only a 225 from 60-62. Those dates look like the dates the 170 engine was produced, and the 225 was produced. But there is no difference in the gaskets sets, between the 170 and 225 iron engines, so the differenc in part numbers does not make sense. The price of the sets, looks like it should be for an aluminum engine set.
PS: The only difference in the gasket set between the iron and aluminum engines is the head gasket, and the rear main seal.