Hi - I see that you posted several months ago nobody has gotten back to you. I do not have the dimensions or an adaptor plate but I could walk you through how to do it yourself. I have made an adaptor or two over the decades. You could probably "get away with" using a good drill press although a milling machine would be preferable.
Or, alternatively, did you find someone who had what you needed already?
Either way, best of luck!