I've been able to find the 2721 bulbs (as listed in the Sylvania book) very easily at the local Pep Boys. They are 1.2 watts each and used for the 2 lights inside the instrument cluster as well. They pop right in.

The packages were $3 or $4 for 2 bulbs.

Note that for 1980 cars the Sylvania light replacement guides (the book, on the website, and the electronic gizmo at the store) were not complete (or accurate, for that matter) for the 1980 cars. Choose a mid-late 80's 560SL in the selection guide and you'll get the right bulbs you need.

The store also had 2723 bulbs which were 2.3 watts if i remember correctly and put them inside the dash. As an experiment I bought one package and put them inside the instrument panel. They were really bright but after running them for 5 minutes you could feel the heat building in the area, so I took them out. I really don't know how 5 watt bulbs would survive very long.

I also bought a bunch of blue "74" internally reflected replacement LEDs and put them in the instrument panel and the climate control panel. They looked quite cool but, honestly, not bright enough to be practical.

I could not find the shifter bulb anywhere since it had a different base, so I wound up going to the dealer for that one. The bulb was $3 I think, search my messages for the exact part number.

Steve

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'80 450SLC 122k Dunkelblau/Palomino