72 c10 with rear leaf springs question

[DTMsurf]

So my truck was set up with a tow,hauling, package from the dealer so it has leaf springs on the rear. I haven't had any luck finding lowering kits that have what you need for rear leafs for a 72 C10. They list kits for 1973 C10 will that work? I would look under suburban or C20 C30 but the rear end might be different I'm not sure. Any help is appreciated!