I have been told that ICM ..International Crystal Manufacturers in USA is a good source for FT301 and probably FT221 crystals. Apparently..they have all the tech information on file and can satisfy your requirements ..I think they charge about $22 per crystal. I will try and firm up the details and post them here later -- My web site needs to be 'uncluttered" but I am too busy to do all the work just now..73 Earl VE3AB