My opinion only. I prefer the stock GW alternator clocked for the Valkyrie.
'97 Goldwing Aspencade Part # is 31100-MT2-015. Currently cheaper than the Valkyrie Alternator and simple to pull the 3 long screws, clock the housing to match the Valk, and replacing the 3 screws.
Your mileage may vary,
Hay

Jimmyt