No the '79-'85 calipers will not work. Those are a completely different caliper. I do make the lever, cable brackets and sporing kit for the '76-'78 Eldorado calipers. Or you can just buy new calipers here.
https://www.ruffstuffspecialties.com...m_medium=email
Unfortunately they are currently out of stock. You might call or email and ask when they will be receiving more.
There are a few of the reman calipers on ebay.
https://www.ebay.com/sch/i.html?_fro...liper&_sacat=0