Hori split pad pro analog stick replacement

I have the hori split pad pro since release. Now my left analog stick makes a clicking sound when pressed forwards or backwards. Im wondering how to tell what type of analog stick it uses to replace it with? I would like to be able to put a higher tension stick in it if possible but not necessary. The analog stick is on its own board so it would be very easy i think. I’ve tried searching but there isn’t much info out on it. Any help would be appreciated.