Geeetech Driver Wheel with MR84zz Bearing

I had an MR84zz bearing give out in the drive wheel for the X carriage. It's going to take a couple of weeks for replacement bearings to arrive from GeeeTech. I found this http://www.thingiverse.com/thing:1354761 to replace the drive wheel. While it worked I found it to be a tad bit bigger than the original wheel. I decided to make a drive wheel based on my original part. I have also included a DWG file for modification.