Back to OP's original question. I heard back from Codan. Here's their reply. Sounds like he is not certain about his answer, but it's a start. I've asked him to verify his info. NBR is Nitrile Buna Rubber, aka Nitrile or Nitrile Buna

"Info
4:15 AM (5 hours ago)
Reply
to me
Hi

Hose is not produced for many many years.

Could be an NBR inside.

Hans Andersen
Codan Rubber Danmark A/S
Mobile device
www.codan.com"

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked