short bed stepside taneau cover?

[mookandairin]

I see taneau covers all over marketplace but I am having a hell of a time with the measurements for my 65 c10 short step. I am looking for a hard cover preferably the flush mount type to keep that awesome look I got going (drag truck big tire) kinda hard to explain but what are the measurements I am searching for if anyone knows? the used market is ripe for the picking but I dont have the several hundred dollars right now for a new one. I am sure you can relate. Thanks a ton