This is a set of 1/2" MDF YZ plates.
1/16" holes for #4 wood screws on the linear rails.
Wood stain works well to make these any color you want.
New LR3 Parts, I will be making these to order so they typically will take a few days to a week to ship until things stabilize.
As of 9/19/22 - The flat parts will be shipping the v1 updated version of these plates.