There is a thick 'diaphghram' that seals the top of the fuel distributor from the bottom (and the intake manifold) I am not aware if that part is available. If it is, it CAN be replaced.

The distributor is a very precisely adjusted flow splitter. It accomplishes this task by keeping the PRESSURE to each injector identical to the others. EACH outlet has to flow the same amount of fuel as the others across the full range of flow rates (idle to wide open) there are spring adjustments for each cylinder that accomplish this 'balancing'. It requires very precise (and costly) equipment to adjust the fuel distribution. DO NOT ATTEMPT to adjust the fuel distribution balance. You will definitely screw it up.