Chastity cage ring no size fits!

I for the life of me can’t find a chastity cage ring that fits. I’ve tried from 42mm(1.6in) all the way to 55mm (2.1in) and I’m getting really fucking tired of spending money every after measuring and the ring not fitting! Does anyone know where bigger rings can be found? The biggest I’ve seen are the 55mm (2.1in) and nothing bigger.

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