Thanks, that solves what two of them are! Still having trouble finding what the longest of the 3 is for. Half of it looks like E bodyThis might help (thankyou cudak888)
How to identify B/E-Body firewall mounting plates, manual vs. power | 1962-1974
http://www.forbbodiesonly.com/mopar...ting-plates-manual-vs-power-1962-1974.117312/