I've been trying to find a replacement Bendix hydrovac- booster for my '74 C60. I must be looking in the wrong places? Not having any luck. If someone knows of a place, would you post it?
Several places rebuild them.
I'm in a similar situation with my 84 International S2500. I found a friendly dealer in Canada who is happy to provide me parts numbers and info on US dealers who have stock. Then I try these guys (Fleet Truck Parts 800-541-5905) to get a good price. Once you have the part number, you can try fleabay etc too.
Try Miller's Truck Parts in Portland, OR. Maybe have or know.