From the Mercedes Dealer:

The plastic " > " knobs that attach to the front HVAC controls (one was scratched up, the other missing in my case).... 107 833 05 40 ... $2.59 each. You'll need 2 or 3 depending on your setup (I needed 2). They are not interchangable with the 116 controls (116 833 03 40) which look similar but have a different rear end (as I found out the hard way.)

The light bulb that illuminates the "PRNDSL" transmission selector was impossible to find at a parts store since it has a different bottom... 072601-012110 .... $3.00 each. After you remove the wood (or vinyl covered) cover with the window switches, etc, on the trans selector itself there is a small tab on the left side. Pop off towards the left with a flat screwdriver to reveal the bulb socket.

Not from the dealer:

The light bulb that illuminates the "Hazard" light on the switch pops out (There's a little tab directly on the switch) and is the same as the bulb that illuminates the instrument panel. Sylvania 2721.

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'80 450SLC 122k Dunkelblau/Palomino