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This is a standard Bosch regulator.
Has anyone tried to use one of these on the bike? I bought this a few months ago but yet to fit it. It looks like a direct bolt-on. If needed the regulator can be removed and fitted somewhere with airflow.
This cost me about 20 dollars.


Click to enlarge.

That is a regulator from a K bike or an oilhead. Also used on Bosch automotive alternators in Benzs and VWs and the like.

I doubt if you can make it work on your R90S.

If the screw holes can be lined up, they will fit. I will try to mount it very soon.