My truck is in fact a first series but I am trying to duplicate the truck of my youth which was a 1954 with second series armrests. The tough thing about this is I was certain the bases of the armrests were blue. As far as I can find, no one makes an armrest with a blue base. The Filling station does offer a second series blue armrest DG-23 but I think it's a black base with a blue top. My interior was the two tone deluxe blue, they didn't get special arrests did they? Although I have never seen anything on this I could swear I have seen a few two tone green interior 54-55 trucks with the later looking armrests in green. In fact there is a 55.1 truck on ebay with the deluxe two tone green interior and it has old green 55.2 style armrests in it. Here is a link
ebay
