I have many many crystal in my ebay listiing including 2950KHz which may be close enough to 2940KHz. See http://www.ebay.com/itm/HC6-U-HC49-U-CR81-U-FT243-Collins-S-line-KWM-2A-51J4-R390A-PRC-6-6-PRT4-crystal-/302022680690?ssPageName=STRK:MESE:IT These are from my lifes time crystal collection since 1960's.