LGT 18H Drive shaft problems

Hi all I am new to this site and need some help. I just purchased a 1989-1991? LGT 18H with a drive shaft problem. The U joints were worn out and the yokes rubbed causing dammage beyond repair. New Holland wants way to much for a drive shaft assembly $816.86. I am unable to find any information about the small sized U joints. Has anyone repaired or replaced their drive shaft? What did you use? Any idea where I could get a used one? Any suggestions would be appreciated.

Thanks

Al
Located in Muskegon Michigan