Just for example:
Dimensions in the specs:
I assume anything marked “ITX” would fit your need.
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Myself, I have the space for the length of the RX 6700 or 6800. But I asked CoPilot about the ones for my case and motherboard that are under 9" and none of them would fit your space. Here is what was suggested for under that:
Sheila
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My RX6400 is 17cm.
What happened with your RX560 card? It should work.
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Well, the rx560 card didnt work on my system, so I returned it. I have ordered a rx580, so will see if this one will work. If it doesn’t, I may try reimaging my pc with a different linux os.I do not have a spare pc to test the cards with. I may try to set up a vm, and test that way. 
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All you should need is the 'amdgpu’driver.
You can test if it is loaded with
lsmod | grep amd
and you dont need to install a new linux to test it… use a live .iso on a usb stick.
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Ok, thank you. I will try that, and get back to you.
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