I had my wife and kids in the car Saturday, on the way to a park in our 56 Studebaker when the fuel pump diaphragm ruptured. We were near a Western Auto store. Regular auto parts stores were either not open on Sat . then or maybe closed at noon. For young people who were never in a Western Auto, they were a auto parts/ hardware,/ toy store that were open every day. The had rebuilding kits for almost every US car. I got a kit for my Studebaker, it came with a new arm, diaphragm and spring. I replaced the spring and diaphragm in the parking lot by just unscrewing the machine screws that held on the top of the pump,.Never took the pump off the car. I don’t think I ever saw anyone buy a new carb, generator, or starter, in those days. Even if your carb was so worn that the throttle plate shaft was leaking air you just drilled it for brass bushings. We did not have a throw away society then, everything was fixable. We had a company in Buffalo that did nothing but fix small appliances. small appliances were relatively more expensive then but were US made and performed beautify. You cannot buy a toaster today that will make toast as well as the old Sunbeam toaster of the 30s and 40s. Perfectly ,evenly done every time, just to the degree of darkness you set.