Hi Ben,
You may get the following parts for the pull-pull linkage pictured in your post.
Rigging couples:
https://www.towerhobbies.com/cgi-bin...?&I=LXE073&P=M
Ball-bearing adjusters:
https://www.f3aunlimited.com/ball-be...ter-2mm-fh5001
Cables:
https://www.f3aunlimited.com/secraft...cable-8mm-1-32
MK used to offer a super light pull-pull system for 2M but I could not find it from Central Hobbies' website anymore.