Source for largest honeycomb for falcon 2 pro? Unrelated to max cut capacity

Hi! I have a 500x500 honeycomb. It doesn’t accept (flatly) an 18" sheet height-wise. There is more room behind and in front of it. I understand that the machine has a physical movement border.

Has anyone found a larger honeycomb that fits into the tray so that I could place that BARELY larger sheet onto, even though the laser couldn’t reach the max Y? I just want to be able to use larger sheets and flip them.