Mostly this is due to multiple different suppliers but also the taxis could be ordered with the larger brakes .
If you look on RockAuto.com they'll usually break out the different brands , ATE , Girling , Bendix etc. .....
Most of them interchange , good thing you had what you needed to make it work .
-Nate
Alan wrote :I was operating on the apparently mistaken impression that most 80-85 123 cars had identical front suspension and brake components. I ordered a set of front calipers for an '84 300D. When I got them they looked comparable to what was coming off, but after installation the calipers rubbed on the hub. When I talked to Cardone's technical support staff they said that they had only 1 pair of part numbers for all of the variations including the 240D. I confirmed this general practice with the listings on several other sites offering rebuilt calipers. Since the 240D's and some early 300D's use 278MM dia rotors and the later 300s use 284MM rotors this seemed strange. I had already successfully fitted 300SD calipers to the car on an emergency basis. Since I was reluctant to go through another lengthy and expensive caliper swap, not being sure of what I would get, I installed a set of 300SD 284 MM vented rotors and matching calipers that I had in stock. The interesting thing was that the wheel bearings were not interchangeable between the 300D and SD. Can anyone shed any light on this problem.
--Al Boucher
Posted by: Alan Boucher <alsthe1@gmail.com>
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