This is a GENUINE SPICER forged yoke in 1350 series for the GM Chevrolet 12 bolt CAR rear. Top quality Spicer yoke, straps, bolts and u-joint in 1350 series, super strong and durable. Comes with seal, nut and collapsable spacer too!  (USE  OF THIS EXTRA LARGE 1350 SERIES YOKE REQUIRES THE USE OF LARGER DRIVESHAFT AND TRANSMISSION YOKE, THIS IS EXTRA STRONG HIGH PERFORMANCE AFTERMARKET DRIVELINE PART)  This is not a stock replacement. Questions? TOLL FREE 1-877-614-4327 8:00 to 5:00 EST