One very nice complete set of bushed adjustable rocker arms, bushing measures 0.812 ID , I don’t have a good mic, I believe they are NOS, only markings are W-Co. I got these with a bunch of 1950 Cadillac parts and don’t know the exact application, they fit nicely on a Cadillac 331 Rocker shaft, They have a little flash rust from shelf life, I’m sure they would need different pushrods to work on your application last photos are on a 331 Rocker shaft next to the stock Rocker arm