Kodak series VI ring size 44.5mm with wider threads

The top is a Kodak series V to VI step up ring. I need the VI portion with threads (I don’t need the smaller series V hole).

They are both same 44.5mm diameter but the lower black original one has much wider threads. The kodak one has very thin threads. Do you know of other ring that is 44.5mm but has wide threads too like the black one?