14 inch big bolt steelies and disc brakes

Your OEM should be 4 inch bolt circle, 7/16 studs, left hand threads on left side. The later model disc brakes you found are 4&1/2 inch bolt circle, 1/2 inch studs, all right hand threads. Should still be plenty of the later 4&1/2 bolt circle steel wheels available but I dont know if your OEM center caps will fit all of them. Good luck