Scroll Bars: Hook & Loop (or Baste) System - Extender Side Bars

Needs to be ordered

All parts are sold individually - add Scroll Rods and Knobs to complete a set

From the website:

The two extender bars are what hold the scroll rods a set distance apart and create the sides of the scroll frame.

Extra knobs, scroll rods, and extender bars let you create a custom scroll frame, or to add to your existing set.