Quoted from Miguel351:Scratched my previous post. Now it's this:
Found these on eBay. They look correct for most pre-war games, definitely for Bally games as they look identical to what I've got on my 1938 Reserve. I'm going to message the seller to get an exact measurement on them to be sure they're correct.
ebay.com link: itm[quoted image]
Pinball Resource has these for 90 cents. http://www.pbresource.com/gtbsd/leg-plate.jpg