Echo the comments about the machined bump. I’ve also got a once creaky CAADX fixed via a Wheels Manufacturing thingumybob. The adapter needs a step in it to accommodate the bump. I was going to glue in one of those cheap FSA sleeves but it wouldn’t clear the burmp (best Clouseau impression).
I wouldn’t piss about trial and erroring. The Wheels one fits, the FSA one doesn’t. Any one that matches or has similar dims to the Wheels should do it. Get the rebate position and depth measured and if it’s similar, you’re away. Also check the derailleur hanger bolts are correctly torqued and threadlocked as I had a double creak due to this and the dratted BB30.