Fits Chevrolet 1965-1972 12-Bolt 8.875 Inch Rear End

*This spacer should only be used when using the Series Four Gearset on a Series Three Carrier. See image 2 for more information on the differences between the Series. The thickness of this spacer, .305"-.315", coincides with the difference between the series 3 and 4 Carriers. The Series 2 Carrier, being only a little over 1/2 inch thick at the ring gear flange, is not suitable for mid to high HP with slicks.