Pin-on Bucket Mounting Specs

I have been investigating adding a ditching bucket as well as a close-mounted quick coupler to my standard dig bucket collection. In the process I have tried to obtain the OEM pin-on bucket mounting specs, i.e., pin diameter, pin center-to-center dimension, & the pin mount face-to-face dimension.
So far, I've been stonewalled by both OEM's & bucket manufacturers. The manufactures say they will make the bucket (or coupler) to OEM specs, but they refuse to tell me what they are! Moreover,...

Pin-on Bucket Mounting Specs

Pin-on Bucket Mounting Specs