Fuel pump leaking

Fired up my 1959 Ford Fairlane 500 (Galaxie) recently, and there was gas leaking from the fuel pump/vacuum booster. I don't know for sure yet exactly what is leaking (I'm guessing diaphragm...?). I can't find anything online about buying just a diaphragm for the pump, I only find the entire pump/booster for sale (and the ones I find for sale look slightly different than what's shown in my repair manual). Do I have to replace the entire pump/booster, or does someone sell the diaphragm? Any tips appreciated!

I always had to buy a whole pump. I had taken the pumps apart to verify it was the diaphragm. And for an emergency fix used RTV black to seal a small hole on the side that doesn't have fuel flow past it. But more times than not the diaphragm was rotten, the springs worn out, the pin for the arm worn out that you had to replace the whole thing.

Thanks, I think I will just buy the whole pump.