My 11 year-old repro R59 died this year. I could not find a new repro at that time so I purchased a group 24, thinking I would get a topper later. What I didn't know until I got the 24 home did I see it has the wrong shape top for a topper to fit.
Since then, I found a different repro (AGM) R59 manufacturer that I may order from.
https://batterycentralmall.com/produ...72-delco-sr59/
I also saw a different manufacturer that makes a lithium version but I don't trust a big lithium battery in my '68 and in the garage.