5I20 replacement

Ten years ago I mounted a 5i20 on a friend's lathe. I remember we used all four ports because he wanted to use the original switches for feedrate and other things. Now he'd like a spare board in case of failure. What can I use with four ports?

Thanks Tom, but I had already seen that they only have three ports and you need four like the 5i20. With the binary switches and tool changer we used three 7i37s and a 7i33 for the analog spindle.

My fault! I wasn't close to the lathe  so I couldn't see the model. It's actually a four-port  5i22. Sorry again.