Being just a cab, it's irrelavent whether it's a 5100, or a 5700, or a special, since there's no chassis to match the number.

The RS prefix is for the regular '48 5700. The special would be a three letter prefix (with the extra S), as in RSS.


Curt
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1953 Chevy 6400, 1957 Chevy 2dr Sedan
--"Mediocrity is easy, the good things take time"