This front/rear gantry support brace uses M6 rods, and is designed to be used with the bottom brace from this gantry support, which uses M10 rods. This creates a compatibility problem.
I have modified the bottom mounts to use M6 rods, so the 2 braces can be used together
The author remixed this model.
Changed to accept M6, to make it compatible with other top mounts that use M6