I am working on converting my shoptask eldorado bridgemill to cnc. I think that the timing pulleys I need are XL style, 21 tooth, with .375 bores to go with the steppers I purchased from Camtronics. Can anyone confirm this pulley size and type being right and can anyone provide the belt part numbers I need? Also does anyone have a source for the required pulley? My standby MSC doesn't have a .375 bore xl if that is indeed what is required.