s-10 frame for 50 chevy truck- odd length?

I have found an s-10 frame in my local area and am contemplating purchasing it...but the measurements seem off to me. measured from the center of the front hub to the center of the rear hub it is 123"? From some of the writeups I have read the 1950 P/U is 116" and the s-10 swap was the best fitting frame at 118". I'm I totally off my rocker, or measuring this s-10 frame wrong?
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Have you had a look through here?

http://www.jalopyjournal.com/forum/showthread.php?t=274702

 

The S10 frame is adjustable, just cut the weld loose at the joint and slide the two pieces to your length and reweld.