Or this thread
may help too, complete with pictures. The pics are from a 126, in answer to a 123 question, should be about the same for a 124.
Took forever to find the link.
'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.