I have a 89 c3500 dually mutt. It has a 6.5, an nv4500. The ujoint that goes to the back of the transmission, one side is 1/2 inch longer than the other. How do i find a replacement? Need help, need the truck for work

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Pick the joint style here,move the mous over the designations for a picture and click what you have,then enter the dimensions to get a part #:
http://www2.dana.com/expert/wc.dll?DSD~dedsec~2~13~