Quartz Oscillators: 26,400 MHZ and 26,500 Mhz
or any pair with the difference in 0.1Mhz in around 25-27Mhz range
I am building USA to NZ Radio Frequency Shifter prototype for US Car Radios to be picking up FM stations in Auckland (Wellington is fine as you use odd frequencies - same as in USA). Nothing close on eBay; Jaycar; Surplustronics or Trademe :-(
Checked yesterday my pile of Quartz Crystals - the closest I found was the pair (26,59 & 26,69 Mhz) sitting on unidentified box from year 2001: