I'm guessing the #'s don't cross over because they had a shorter threaded hole where the pulley attaches than they did in later years. If it were mine, I would find one for a newer model and install a longer bolt in the hole to match the jack shaft spec's. The drive shaft was the same way which is why they were having lower pulley issues that first year of the quick-drive where the bolts couldn't keep the pulley tight.
Did mine a few months ago, best solution I could find was a shaft with the clutch side bearing pre-pressed on, then pull out the qd side bearing (with heat!) with a blind bearing puller, pop in new shaft, etc.
