Get the dimensions you need including depth, go to the nearest RV dealer and get a copy of their parts catalog and search thru it. Check out online mobile home parts suppliers, even Lowes or HD web sites may have what you want. And a google search will turn up many possibilities.
Texas Baptist Men-Retiree Builders member since '01
13 Silverado 3500HD D/A, 2wd CCSB srw, custom RKI bed
11 Cruiser CF32MK