Were different vendors used for wheel hubs

[jvb6648]

'68 with front disc brakes. Were different vendors used for the hubs? Both have GM bolts attaching the rotors but the head markings are different and one hub is machined around the od on the seal side. I thought one might have been replaced but then the bolts for the rotors should been the same on both sides.

[JohnZ]

'68 with front disc brakes. Were different vendors used for the hubs? Both have GM bolts attaching the rotors but the head markings are different and one hub is machined around the od on the seal side. I thought one might have been replaced but then the bolts for the rotors should been the same on both sides.

Original front hubs were made in-house by Chevrolet.

[jvb6648]

Thanks, maybe I should have said plants instead of vendors. I was just wondering if the hubs and spindles came as an assembly from an axle plant and if so did they use more than one plant. Just curious why the hubs and rotor bolts are different. Not going to lose sleep over it and going back together like that.