73-80 stepsiders - a measurement / pic request

[75stepside]

I'm tryin' to locate a trick gas cap for my 75 stepside project - something billet or bowtie or polished, or chrome, etc. First off, does anyone have such a critter and where do you get one??? secondly, can someone take a pic of the reverse side of theirs (from 73-80 truck), and also take measurements (roughly) of the diameter of the cap overall, diameter of the part that goes in the filler neck??

i found a nice cap, listed for 67-68 camaros, but i'm unsure if it'll work w/ our stepsides.