the rotors are for 90's Chevy 5500/2 ton tilt cab trucks. The machine shop said they cant weld the holes because it is cast iron.
Their biggest issue was only having 6 bolts holding the rotor on even though that's all the hub originally had, that with the disks they might shear off because the rotors are designed for 12. they're second fear was that the hub could break off where the rotor mounts.
