Amerock Lazy Susan repair

Hi folks, I've been trying to fix my lazy Susan, and while messing around with it I realized this top piece is broken. I am pretty sure this exact model isn't made anymore, and the number on the piece is 9885-3.

I am not an experienced cabinetry worker, so a lot of this is very new to me. What are potential replacement parts I could use to get my lazy Susan working again?

Pics 4&5 show the top component that it's supposed to be attached to.