55.2-59 speaker location

[popeyestruck]

Trying to find a good place to mount speakers without relocation the gas tank. The mounts for the cab corners all say they wont work but there is some room still there for something smaller. The lik shows some that are 3 inches deep and can go under the seat but I think with the solid sheetmetal under the seat it will sound muffled. I was think I could mount these hanging from the rail under the back window (59 small back window) They are 3 x 12 1/2 x 11 https://www.classiccarstereos.com/un...pair-250w.html Anyone have any experience with this?