Yes, tried to search...
The hose that goes from the head, next to the oil filter, and to the firewall. Mine has a galvanized elbow just about 3 inches from the head fitting, with a close nipple on each end. My guess is that it was a quick [sloppy] fix, that the stock one has no such fitting. Correct? Could this be one of the factors why it tends to run a bit hot?
thanks...

__________________
1983 300D- silver blue, tan leather, 205,000.
1975 Datsun 280Z. Stock, ready to restore.
1983 San Juan 23. Dry docked.