My suggestion is use a pair of 1/8"x4"x4" aluminum plates drill some holes for new binding posts.
https://www.ebay.com/itm/322424383436?hash=item4b11fda7cc:g:8REAAOSwwE5WY0bs
https://www.ebay.com/itm/322967057132?hash=item4b325632ec:g:8REAAOSwwE5WY0bs
If you don't need bi-amp/bi-wire, connect all wires to one pair of binding post and no jumper required.