[memo43]

I have a 78 blazer frame on mine, and useing a 15 gallon fuel cell.
only fab work i had to do was the straps to hang the fuell cell, and all thread.
I used 1" flat metal and shaped it to the fuel cell. used the spare tire mount to attach it. Im pretty sure it might be the same for your set up, or why not go with with the stock locatinon for the C10.