X-carriage for Mendel Prusa v2 with fixation in opposite side and 4 ball bearing mounts

It's the original X-carriage for Mendel Prusa v2 with another fixation in the opposite side plus 4 ball bearing mounts (instead of 3 in the original design).
The 3 ball bearing mounts version is available here: http://www.thingiverse.com/thing:49753