There was a chat at Sunday coffee about replacement regulator/rectifiers for older bikes. I've had very good luck with the Podtronics components on my Norton, with it's updated 3 phase stator alternator. The main supplier in Canada has just released it's annual fall sale on many components, including many Podtronics units.

https://mcusercontent.com/31f86f1ba8b15be87d8e0a6ad/files/9e7281b5-5986-ebfa-0afe-a3de0e21ec24/Walridge_Annual_Sale_Flyer_2024.01.pdf