When I initially was designing my XMODS, I was going to have a pimped out version with spinners and was gonna adapt these: http://icedoutgear.com/spinning-rim-shoes.php , although I never went through the trouble of measuring them to see if it would work.
Those are not spinners that is easily done by disesembling a larger motor than a 180 (or something) and unwind the wires off the amater and pull the spacers off the shaft and there you go you should have at least 20 spinners now.