Strange Pilot/ hub size on 8.75 Rear drum brakes

the 4'' bc axle reg hub is smaller as well as the measurement from the flat of the flange to the axle housing as well . a 1/4'' different spacing . so your fix is a tubing spacer , but it must be tight on that short hub are they will far of while your driving the car . guess you could mig weld them in place on the inside of the ring and axle hub . they will have to be right on center if the rim is to reg on them .