Ok, doing a disc swap per the Mopar Action article and I'm stumped on the calipers. I've been on the RockAuto, Advance Auto Parts and Autozone websites and none of their calipers look like the "4" or "5" calipers in the attached photo. I'm looking at calipers from a '76 Cordoba. The hose mounts are different and apparently that's critical.

Also, in the article it gives aftermarket part numbers EIS RC6066/65. Who the hell is "EIS" ?

The article doesn't seem to specifically tell which model to get the calipers off of so I'm stumped.

Thanks!