Need to find someone to rebuild my power brake booster

You can do it yourself.

Buy the kit and seperate the two halvs and I stall the parts.

The booster is a simple device.
I would if I could find a source for the innards (know one?), especially the rubber diaphragm which can harden and crack from gas fumes. Happened to one of mine even though I added a carbon filter in the vacuum source hose. The hardened part was right at the vacuum port. Might have degraded before I added the filter. Midland-Ross boosters are easier to take apart (V-band) than Bendix (crimp collar). I tried to fix one by cutting neoprene rubber for the diaphragm (mostly sheet-metal, sheet rubber just at the periphery), but the rubber cracked. I had 2 M-R boosters that looked similar but varied in the diameter of the inlet piston and matching hole in the base.