I found the part number for the replacement actuator caps.

3 340 522 025 850

I haven't tried to get any myself, but heard they can be purchased through a Bosch Dealer.

pizzachef's link is an excellent DIY thread. While you're there check out the other DIY's. Andrew has written a bunch of good stuff for 123s, including some great info on SLS troubleshooting.

__________________
Chad
2006 Nissan Pathfinder LE
1998 Acura 3.0 CL
OBK#44
"Pleasure in the job puts perfection in the work." - Aristotle (384-322 B.C.)

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1985 300TD - Red Dragon
1986 300SDL - Coda
1991 - 300TE
1995 - E320
1985 300CD - Gladys