Wowsa. Even though this fits my car, it's not a restoration worthy of it... but somewhere there's an L88 Corvette that needs a battery!
https://www.ebay.com/itm/NOS-1967-1968-69-CORVETTE-GM-DELCO-R59-E-5000-BATTERY-BUICK-CHEVY-OLDS-PONTIAC/172284846600?epid=18004645889&hash=item281cfa2208:g:LjgAAOSwtnpXl4ea&vxp=mtr
It's the same pricing situation with NOS Ford and Mopar batteries too.
Tons of "tar toppers" to make a conventional battery look vintage seen on the Barrett Jackson cars lately.
Restoration Battery has thrown in the towel, the website was offline by march 1st.