just ordered a rupes 21 with the standard backing plate. I want to pick up a few mf pads for it. with the sale, what should I get? I have 5.25 inch pads but that would require me to swap out the plate. I have 6.5 and 5.5 css pads along with my gg with the 6 inch plate. I also have a hf unit with a 3" plate and a 5" plate. I'm guessing the meg pads?