I would contact atvpro on the board here to get a good used one.
Randal fabricates fantastic 67-72 vintage 4-door crew cab truck cabs and uses Suburban donor vehicles for parts so he has a few select Suburban specific pieces in his parts collection that do not get used on the crew cab trucks.
Here is one of his builds
http://67-72chevytrucks.com/vboard/s...d.php?t=499490
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69 C10 shortbed stepside 400 small block - built like what a super sport truck could have been
https://67-72chevytrucks.com/vboard/...d.php?t=484426
69 K20 lwb TBI 350 4L60E NP208 14-bolt Dana-44 w/disc
68 Camaro SS / RS 500hp 439 inch roller cam big block 4L80E