@Best4x4 So I actually have the hardware, but I will never need a dog guard. I have the two upper pieces and one of the lower pieces, but it looks like the other one is broke. If interested let me know and shoot me an offer- I can model up and 3D print out the other bottom part without too much difficulty.

EDIT: If I can figure out how to release the bottom clip, that is...

 

I'll hit you up after the holidays for sure. It would be cool to use it! I've had it maybe 8 years now, just never could track down the hardware.