Sure, you can use the 6.5" bp with 7.5" pads, but I personally prefer to use smaller pads with the PC. I have a stack of 7.5" pads that I bought a while back for my PC that I will now only use on my rotary because I didn't care for the way they worked with the PC. A flat 6" pad like the LC, Sonus, or Propel is the only way to go in my book.