CHEVY GMC 4X4 SPICER K20 DANA 44 60 BLUE SPICER LOCK IN OUT HUB BIG 19 SPLINE These are plastic molded parts to original specs, you will need to use your original seal and o-rings. These are molded in the U.S.A. not a cheap import. This is a nice addition to your restored truck, this is for a set of two.