I think the usual for most of the PBG range is 12” or 14” radius, I know that the ex Washburn Neck in my FrankenWashie is 19”, as is Experiment #2.
i think the Ibanez is also about 14”, the G style ones I have I think are 12”
That’s a good thought Mark, there’d be a plethora on Alibaba.com as well