Need a bed floor patch. Newer trucks have the same pattern?

[1972_Buford]

The PO told me someone cut a hole into the bed floor to install the dual tanks. The dual tanks are still in the bed of the truck and I have no intention of installing them. The PO put a piece of galvanized steel over it which looks like crap. My plan is to put in a roll on bed lining which means I need to patch this hole the right way. I wanted to know what years of trucks will have the same spacing for the ribbing in the bed. I figure I can go to a pick a part and cut a patch out and weld it in. I know LMC carries pieces for about $25 but wanted see other options.

Thanks
B