Santa will be bringing me a K2 for Christmas this year. I noticed that the web site lists the matched crystals for the filters as shown below. E850006 Matched Filter Crystals(7)for the basic (CW) K2 K2KSB2XTLS Matched Filter Crystals (14)for existing K2 and KSB2 combinations. Are these better matched crystals included in newer K2 kits or are they applicable to all K2s? Thanks and 73, Larry Benko, W0QE