[nikwho]

The frame widths are the same, so you've got that going for you! I just recently paid $50 for a set of truck arms, the cross member and all associated brackets! I bought all of that to swap my '68 GMC from leafs to coils, and now thinking about the same swap for my '59! Luckily, my '68 C already has the same factory crossmember, just without the brackets to mount the arms to, so, I have that to use for my '59! I'm thinking of making a jig off of a factory arm and building some tubular arms for the '59. I haven't checked the height of the crossmember yet, but did verify the crossmember could work.