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Yes, that would be the Bracket Axle Unit and the protrusions not being prominent enough.
Any shadow one should be fine. The sticky out bits on the RD-r8000 one look a bit more beefy from the pics. You might wanna check with a shop?Part number is Y3E998020
https://www.sjscycles.co.uk/gear-spares/shimano-ultegra-rdr8000-bracket-axle-unit-y3e998020/?geoc=AU
Thanks! Yeah, it's a little tricky to explain.
Not sure if I've got the right terminology.
Basically this bit here feels wrong.