Almost all fuel distributors that are for sale ARE reman units!! A new one would be $2500.
Rebuilding isn't possible even for the best technician in the best shop because there aren't ANY parts available & you would need a $25,000. flow bench to set-up the fuel distributor.
There are a few "aftermarket rebuilders" but with a 30-40% return failure rate. IF you want to eliminate a running problem USE a Bosch unit.
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)