Originally Posted by JCKN
10, that's what these guys use too....
http://www.progressiveautomotive.com/Boxing.htm

My father in law works in a metal fab shop, so i was going to try talk him into cuting them out on his table. Just need to figure out how/what measurements he needs to set it up.

Some metal retailers will have scrap metal from stuff they have cut. They will cut any size you need

~Jim