Parts shop should be able to get the diaphram for you. The job is no big deal except for a couple item. First the screws that hold the cover on can be difficult. Onlt 4 if I remember correctly, but they are slotted screws not hex nuts and they can be difficult. The only other problem is that you have enough room for 1.5 hands and you need 3.0 hands to get the pieces inside the diaphram tube and assemble it on the end of the rack. Experience is a plus but other wise it just takes patience and fortitude; once everything is assembled around the rack pin your home free. Just pay close attention to the order of the springs and shims when you remove the old diaphram from the rack.

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Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician