With winter at our door steps, now is always a good time to access battery options.
If you drive you van in the winter, and live in a northern climate, and your battery is over 3 years old (I got 10 years from my last battery BTW).
Found this on The Samba, with some recent finds like a Group 91 / T6 "Diehard" that appears to fit without modification (720 CCA, 3 Yr Free Replacement).
https://www.thesamba.com/vw/forum/viewtopic.php?p=8395552

  
A good reminder to keep a good float charger / battery tender if stored for the winter.
https://www.autoguide.com/top-7-best-trickle-chargers-for-your-cars-battery 

Jack R.