First, welcome to OCC..........
The 982 had three mower deck options. That being a 46", 50" and 60"
Focusing in on the 50" deck (50C or 190-359-100), there is the
190-361-100 Mule Drive (or Adapter Pkg) that is needed to properly mount the deck to the tractor.
If you have the correct Mule Drive, the proper PTO belt is:
954-3006
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Roland Bedell
CC Models: 100, 105, 1450, 782, (2) 784, & 2072
Buy: Made in the USA