Ettore Soren Squeegee Rubber

Hey Everyone. I bought the Ettore Soren Squeegee Rubber and when I put them in my Ettore aluminum channels they don’t remove the water well at all. It doesn’t fit tight in the channel and I can tug on the rubber in the middle of the channel. Does anyone know any good channels and handles for theSoren rubber. Also what type of rubber should I use in my Ettore aluminum channels. Thanks!

The ettore Soren rubber is meant to be put in Sorbo channels I believe.