Here are the mirror details, both sides, that bigger trucks or trucks with wide beds used, mounted on the cab. Could use on a small truck just the same if desired.
http://chevy.oldcarmanualproject.com/accessories/1951am/51aim59.htm

Sorry, thought this was for 48-54, not the later.
Check accessory manual for your model, probably something like for the older trucks.

Last edited by Grigg; 12/01/2018 2:25 AM. Reason: Oops
•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-