iMac Pro Teardown from iFixit suggests that iMac Pro uses the same display panel used in iMac 5K: LG LM270QQ1
If that's the case, you can buy this part in many places, including this Amazon link:
https://www.amazon.com/Apple-A1419-LM270QQ1-SDB1-Screen-Display/dp/B01LVU2CEA
Disclaimer: I'm not the seller and I don't guarantee it will work.