I'm looking at getting TTRS/Aston 4 pots, but I'm not sure what discs to get. I've heard a lot that the 370mm discs warp very easily so I'm thinking I should probably avoid them! The only other option I've seen is the 362mm AP discs but I can't find a price for them anywhere! Is the AP discs and the 370mm the only two options? And what's the price of the AP discs?