This fellow in Australia is reproducing control parts for the handlebar switches and buttons. The replacement parts are very high quality and things like the start buttons have the machined brass part in the molded part. He is not cheap, but he is producing very high quality parts. I would call them equivalent to OEM quality. They are parts made in small batches. He is not getting rich by any means. He also offers refurbishment services if you mail him your controls.
Worth considering if you don't have the skills or need some parts to rebuild a set of handlebar controls or replace broken plastics...
https://vintagemotoswitcheroo.au/vintagemotoswitcherooHe has a Facebook page as well.
He does work on many different makes and models of bikes...
Thought you might want to know about him if you have or rebuild bikes and don't track down NOS controls...
David