Chastity device discussions and reviews discussion

I’m wearing the chastity device shown on my profile, and it’s hands down the best one I’ve ever tried. The only minor issue is that the ring—which they label as an arc ring—is just a touch too large at 45mm. I’ve looked everywhere for a custom-sized version without success. Does anyone know where to find ones that don’t use the ‘standard’ sizes of 40, 45, or 50 mm?