Arite i'm sure a machining workshop here could do it with cnc! its basic dish prob jus forged alluminum.. That dish you have in the pic wouldn't be the easiest to make thou..
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there is no way you will get anywhere to CNC a dish for you.
and if you did, the cost would be ridiculous.
take the wheel apart, and start messuring.
then ring image with your messurments and see what they say.