I've got a spare stainless steel coolant distribution junction if anyone is interested, my original plastic one split a while back and I somehow ordered 2 replacements. Why this part was ever made from plastic I don't know but far be it for me to tell the german engineers how to do things.
"Stainless Steel version of the plastic distribution junction for Syncro only. Drive with confidence knowing your stainless steel distribution junction will not fail!
This junction includes two pieces of hose to insure a proper fit to the firewall."
I'll attempt to post a photo, let me know if it doesn't work.