NOWHERE. No one repros them for any year mustang ii with any engine. It's pretty weak. You can't get a gas tank for a mustang ii either which is especially bad because they are notorious for rotting out on top. If I were you I would take out the sending unit and fix it. It's not hard and I read an article on the net somewhere last year about how to do it and what usually is the problem. I think the float and the contacts were the big culprits. You need to do a search. I am working on something right now to try and get a sending unit for the 1977/78 mustangs with v6/v8 reproed along with the gas tanks(which would work in the 1974-1976 ones too) but it will be a couple of months before it is released. I'll have the first ones made. There were 4 different sending units for the mustang ii depending on engine size and year. 1974-1976 4cyl. had there very own sending unit seperate form the v6/v8 models. You can access this info on this site-
Kelly hotrod - Ford Engines Page 3
it's good for anything mustang ii here's the home page-
Kelly hotrod - Ford Engines Page 3
1974 Mustang II fuel sending unit 
