Up to now I didn't open my GPU to take a picture for you to check if the PCB design is compatible to any of you water coolers.
But someone did and posted a video on youtube:
seams that some power supply devices and the VRAM is part of the cooling design, unfortunately one can only speculate about the height of these parts.
Do you see any chance that one of your watercoolers would fit?
But someone did and posted a video on youtube:
Do you see any chance that one of your watercoolers would fit?