015 545 96 28 for the housing, 002 545 99 26 for the terminal. It was $5.60 for the housing and freaking $4.32(!!!) for the terminal plus tax at the dealer a couple of months ago. FWIW, the fifth terminal slips over the pin with the 4-position housing in place, which is how I had it until the special ordered housing came in. The 5-position housing isn't a must.

Temp sender 005 545 03 24 (and a cup of coolant) replaces the 50*C switch in your SDL. It's a $10 part online. The alternative is a temp sender in head or upper hose turret like 602s have. I tapped the fifth wire into the harness for the 50*C switchover valve to reduce custom wiring.

Sixto
87 300D