It’s a bit of a kludge , but got new hoses and tees from Amin heater lines to the rear heater installed. The stock lines are 1/2” one end and 5/8 at the heater. I used 1/2” through, saved stock ends and made connectors .

At one of the tees, the hose from heater has a 90 degree end . With the replacement plain old 1/2” heater hose it makes for a less than graceful lead in. But I made it work.

I think it’s harder to do this on Syncro than 2wd. For sure I don’t recall being so pissed off when I did it on my 82 diesel westy

http://shufti.blog/2023/07/30/vanagon-rear-heater-hoses-and-tees/

Ab