If it works with Spike 1 - it also will Work with Spike2 Games. Only the Sam System should be different. The Button for the hole should be mit a a square and Look Like this.
Here ist the one you need.
https://pu-parts.com/externer-lautstaerkeregler-system-spike
It's about $34 + shipping + Tax.
You should ask Marco or mezelmods If they can order a bunch from pu to Import them.