Master Cylinder Adapter Plate1962-1974 Mopar A, B & E BodiesIncludes:Adapter PlateStudsHex NutsSAE Flat Washers JEGS 631427 Master Cylinder Adapter Plate for 1962-1974 Mopar A, B & E Body cars allow you to convert from a factory OE 4-stud mount master cylinder to a 2-stud mount master cylinder. We recommend our JEGS universal master cylinders 555-631405 or 555-631406Includes:(1) Aluminum Adapter Plate: 4 in. x 3 in. x 3/8 in. Thick with Black Anodized FinishMaster Cylinder mounting holes are 5/16 in.-18 thread and are on 3 3/16 in. (3.188) centers with a center bore of 1.520 in. I.D.(2) Studs: 1 1/2 in. long with 5/16 in. -18 x 5/8 in. L Thread at Adapter End & 5/16 -24 in. x 9/16 in. L Thread at Master Cylinder End(2) Nuts: Grade 2 Zinc 5/16 in. -24 1/2 with 1/2 Hex Head(2) SAE Flat Washers: Zinc 5/16 in.