Skip, I Had several systems that had bad batteries on them and I found these on the net

https://www.keyelco.com/pdfs/M55p19.pdf

I wanted the steel holder as show in figure 1. I called the company and they sent me 10 of them for free to see if they would work. Other than having to trim the post a little bit they work great and make battery changes super easy. have since ordered 25 more just to have on hand.