Don't know if it will fit his 2000.
'97 Goldwing Aspencade
Part # is 31100-MT2-015
"The terminal & plastic insulator are different where you connect the alternator battery wire. You have to take off the capacitor that is mounted on the Gold Wing alternator and rotate the front housing to match the holes from the Valkyrie model so that it will fit."
BTW it costs much less than the one on the Valk.
This is the alternator part no. to replace the one on the Valk
He is on a wing, not a Valk. You don't have many options. Maybe some has one to loan?