You can go to
www.acdelco.com and search for a local battery distributor in your zip to locate the 85H7YR,,,, but it may have to be ordered. In checking Sears to see if they had a Diehard that fit,,, it was also a no go.
Another step is to measure yours and match the CCA rating with one that has the same dimensions with either top posts or dual post terminal connections.
Red Beard