I would try Fleet Pride. They specialize in heavy duty truck parts. Here's their website www.fleetpride.com I know they do driveline work and may have something in stock or readily available.
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2005 Z-71 ECSB
2007 Yamaha Grizzly 700 FI
Gee, do you think a Chevrolet Dealer could get you one?
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Retired and Loving It!!! 33 years with General Motors Product Service Engineering. A.S.E. Certified. You can fix ignorant but stupid will be a real challenge!