JR Radio crystals. Red/black? Confused on how to buy
All JR rx xtals are grey, except the dual conversion ones, which are red. Since you are using 330, you won't have to worry about dual conversion. The only dual conversion rx JR makes is the 945, which replaced the 940. Make sure you keep using grey xtals in your 330. Good luck on finding a good channel on 27mhz. Not a whole lot to choose from.