The drawer slide used is manufactured by Accuride.
It can be purchased in various versions (different slide lengths and carrying weight).
The version I used on the table is:
DZ3732-0035 350MM ACCURIDE DRAWER SLIDE, 40KG LOAD
The product can be found here: https://accuride.metrol.com/dz3732-0030.html
You should be able to order these at any bigger hardware supplier or even directly at a local hardware store.
Note that the width of the slide is calculated with 12.7mm. Make sure that the main frame and the left drawer have the according distance from each other in order to fit in the drawer slide properly.
List of Parts (including parts required for installation)