With modification, (grinder) the 2nd gen alloys would fit the drum brake trucks. They weren't great rims though and many experienced cracks on them.Weren't the 2nd Gen alloys for the rear discs too small to clear the drums on the older trucks?
A lot depends on where you are, how hard you look, and how lucky you are.I would love to buy another set of NOS rims for my pickup as spares! I don't like any other rim any better.