Used to be able to buy Ohlins R&T forks for Monsters but apparently not anymore.
When I was doing my “Scrambler” tribute 10 years ago, I had Ohlins put their cartridges* in my SBK forks. In the end, changing the whole front end was easier than modifying the crappy OEM forks to accept the Alpina wire wheels.
*When I did it, the tech at Ohlins told me it was the last pair of SBK cartridges in existence.
ETA: When I called Ohlins, I was looking for R&T forks, but they were NLA. But the tech said “Hey, but we have one last pair of cartridges for the Showa SBK forks.”