The diagram is on the radiator support, just right of the radiator (to the left is standing at the front of the car).
DJ beat me to the part number, no problem I was working on the car
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.