Couple things you need to know!
* Only fits ND filters that are tall vertically. At this moment in time I only know of the GEPRC O4 Pro ND filter version that may work. ND filters that are designed for the Avata 2 will not work. Those are wider than the camera cage itself.
* If you install the PLA adapters pointing opposite of what the install guide shows, your O4 camera will push out of the cage instead. This way you can put Avata ND filters, however your camera may be more easily damaged in an accident, so make sure you put on some sort of protection over it.
* It's a really tight squeeze. Besides loosening the main screw that goes into the TPU X square. You may have to loosen the camera cage screws a little bit. Only then, the camera can rotate very easily.
* Using these adapters will not make it as easy to quick swap your VTX any longer. The camera cage may need to slightly or completely be disassembled to remove / install your O4 Pro camera.
Use at your own risk. I'm still currently testing, but I know some of you guys can't wait!