supply of 3 missing linear bearings

I have participated at the very beginning at the Foldarap Crowd Fonding. I have received a box but unfortunatly I had no time to build it.
I took the opportunity of Covid 19 Lock down, to do it and I discover that the 3 linear bearings allowing plate motion on the rods were missing.
Is there anybody that can help me to get them, to manufacture them, to tell me where I can get them.
You can see them on attached file.
Thanks for your help.
JC

Giving these forums a look at as its been a while...

Thought i would reply to this.

The bearings are IGUS bearings and can be obtained from here - look at trying out some free samples too - [www.igus.co.uk]
Make sure you measure the rails to get the right diameters.