My 560, an '86, has the separate bulb for the shift indicator. Not sure if they bounced back and forth between fiber optic and separate bulbs. I do believe many of the later models were fiber optic to the shift gate.
'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.