hi ethanm90 i'm not super knowledgable in the mirrors yet, i've only absorbed a bit on observations while doing other research
i think even the flat bed trucks in that year came with 1 driver side mirror only, and it would have been mounted on the cab attached is a photo of my 1950 1 ton, my mirror maybe a bit bent, but i think that's how it should look, my passenger side mirror i'm not sure if that's original or not. i think i also recall seeing a longer version of pretty much that same mirror for trucks with wide boxes on the driver side, and some folks would simply take the shorty mirror off and cut and weld and extension onto it to make it look close enough to the factory long arm mirror instead of buying the replacement one from the dealer.
i'm also looking forward to what others will contribute on this subject as i need to get my mirrors fixed up too, and my 53 GMC has all sorts of terrible bolted on mirrors that need to go. -s
