You just need to find that breaker. I did manage to find it in stock online at homedepot and bought it. It was all sold out the next day. When it pops up as available don’t hesitate to nab it! I’m not sure if you can place it directly in the Aqua plus. If it doesn’t work with it directly I would have an electrician wire a regular breaker in it and feed it to an appropriate box that the Siemens breaker uses. I used this breaker and this box. If your equipment is outside choose the equivalent outdoor box. My electrician tried to put the breaker in an old existing Gould box I had. It fit but for some reason it kept tripping so he just wired it from a regular 60amp breaker from another existing box I have to that new box and it works fine.
