[Tom Howland]

Ron,
My clutch M/C is a WAG F27047. Yours may be different. I have not replaced the brake M/C yet. I think you are right about being a GM part. I removed the M/C and took it down to a mom and pop auto parts store. They gave me the parts book to look through for the correct picture. Be sure to know the bore size as the same unit can vary. I didn’t and I had to take it back after I installed it.