The male and female 1/4" terminals used on the firewall connector and scattered at random throughout our old mopars. These guys> http://shop.advanceautoparts.com/webapp/...ite_22070210-p#

I can find the 14/16 gauge size in both genders all day long since dorman has those in production.

Is there a source for ones on 10/12 gauge wire size? I know they existed at some point because there is no way your going to shoehorn even a 12 gauge wire into one of those terminals sized 14-16 gauge and have it crimp correctly.

car audio shops... most stock or can get them, they are used to plug wires on the back subs woofers.

Terminal Supply Co.

http://terminalsupplyco.com/pdfviewer2011/default.asp?chapter=connectors&page=p060

Has them from 10 ga to 20 ga.