These are the parts I designed to increase stabilization on my CR-10 S5.

Included are brackets that you can 3d print to use as the joints to attach the extrusions.

For the extrusions I got them from openbuildspartstore.com

for the double extrusion (2040) I had them cut it to 650mm in length, you will need 2 of these ( I bought the 1500mm extrusions and had them cut):
http://openbuildspartstore.com/v-slot-20x40-linear-rail/

For the single extrusion (2020) I had them cut to 600mm in length, you will only need one.
http://openbuildspartstore.com/v-slot-20x20-linear-rail/

I used M4 10mm screws with washers:
https://www.amazon.com/gp/product/B01M6ZBZQQ/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1
https://www.amazon.com/gp/product/B015A39OOO/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1

and for the nuts I used m4 T-Nuts:
https://www.amazon.com/gp/product/B076DWF76L/ref=oh_aui_detailpage_o08_s00?ie=UTF8&psc=1

Enjoy!