I'm selling a pair of Nexen roller pinions that I have.
I can also provide a .dxf of the rack profile that I created in AutoCAD.
If you can make the rack, it's an excellent price for a high end motion system.

www.ebay.com/itm/Nexen-Roller-Pinions-2-Part-966673-RPS25P-BISO050-00MMP3-/301503091000?

Here's a pic with a test rack that I made.
http://www.cnczone.com/forums/attach...0&d=1395094713