This is a new brake master cylinder for 1967-1970 Chevrolet & GMC 1/2 Ton Trucks. The bore size is 1" diameter. Check against your original. Replaces GM# 3912103
1967-1970 Chevrolet & GMC 1/2 Ton Trucks - Both 2WD & 4WD, Blazer
CAN BE USED ON 1947-1959 PICKUPS BY USING ADAPTERS NW-4754 OR FS-652.
This part fits most 1967 1968 1969 1970 Chevrolet Trucks; exceptions may apply. Please read the complete description to see if this part fits your specific vehicle and application.
This product can expose you to a chemical, which is known to the State of California to cause cancer or reproductive harm.
For more information go to www.P65Warnings.ca.gov