Manufacturer Part Number : 238LW45. Application : GMC P35/P3500 Van Brake Master Cylinder Repair Kit. 1970 GMC P35/P3500 Van Bore: 1.125 In.; Moraine Brakes; Stamped NF; Exc. 11,000 Lb. Rear Axle;. 1968 GMC P35/P3500 Van Bore: 1.125 In.; Moraine Brakes; Stamped NF; Exc.