Seems like they went for around $250. Thats from memory. They are relatively easy to replace. I haven't done the job myself. I only do diagnostics. Seems like it takes about an hour.
If you are interested in the steps, email me during working hours and I'll put something together.
BTW, Michael Haven (a member of this forum) owns a shop in Houston. He is one of the finest technicians I know. His business is MPH Automotive. We are members of four tech only groups and both our shops are Bosch Service Centers. I would get to know him.
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician
[This message has been edited by stevebfl (edited 04-23-2000).]