This vacuum booster has an 8" dual diaphragm. It is meant to be a direct replacement for F350 trucks and a direct bolt in upgrade for F250 and some half ton trucks. The included master cylinder has a 1.25" bore and ports on the driver side, away from the engine.
These boosters are not made with original tooling. They are very high quality built with modern 21st century tooling. They are functionally identical but they have a slightly different appearance than an oem booster. This has no effect on performance. The snout on the back side of the booster does NOT fit within the oem plastic sleeve that goes form booster to firewall opening. You can cut your oem sleeve down slightly for clearance, or remove it. The boosters come with a flexible rubber seal that goes in this same location but it is not long enough to make contact with the firewall.
Ford had three major types of boosters form 1968 to 1979. This listing is for the 1968 to 1976 version that has a long straight round rod that connects to the pedal.
I include a 1.25" bore master cylinder with these boosters. They can be used with either disc/drum or disc/disc.
OEM part numbers this is intended to replace for reference:
Booster D6TZ2005H
Master cylinder oem number is C9TZ2140G which is original to 1968 to 1975 F350 and some F250. But this works well with other years of trucks as well.