Jack, the OE number is 000-070-15-62 & has a list of $336.
Try partsshop as they sell bosch OE parts! Most US cars required much leaner mixture durning warm-up and so stay away from them if you can!
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)