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I forgot about the early frames and I knew that being that I've owned them...duh! lol
The duh was intended at myself not you
Actually for K5's the frames changed when they extended the passenger floor in 1978 and the body mounts were moved outside the frame. So it would be 78-91, but the 81-91 frames are lighter versions and they have the angled frame horn for the new bumper.
on an off topic...anyone else notice that that said Minor Meth Church...on the sign behind the frame rail? yea, i know, it means "Methodist" but it's still funny...lol...