I have 1976 Bronco with disc front and drum rear brakes and the original proportional valve. I had new lines made that go from the master cylinder to the Proportional valve and found that my new fittings at the proportional valve do not fit. I saw posts saying Ford used non-standard fittings and found replacement steel lines advertized that will fit the OEM proportional valve, but I can't find the size. I would like to get adapters so I can use my lines that look like the originals.