Oh, I know that one for a fact. The drive for the water pump was a convoluted affair that had a few gears and shafts in the process. One of the gears was NYLON, and prone to getting brittle if overheated. Mine actually lost two teeth AND cracked, it's a wonder that the bike did not overheat. The dealer that was doing the work could not find a replacement gear, I managed to get one from another 1300 owner in Canada, who claimed to have the last such gear from Canadian sources (his brother-in-law worked at a dealer).
To give you an idea about the condition of their charging systems, they use the same stator as most of the GS bikes.
Yep, the R/R is the same, to, but might have different electrical connectors.
Both of those parts cross-reference on many of the stator supply shops.
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Too bad. I like them. Nothing exceeds like excess.