It will work...
If the Futaba RX is Dual Conversion you HAVE TO USE Futaba crystals for Dual Conversion
If the RX is Futaba PCM 1024, it wont work UNLESS those receivers are capable of working in "normal" FM mode (PPM)
The crystals will work IF the INTERMEDIATE FREQ on the Rx is 455Khz - AND THIS COVERS ALL AFTERMARKET RX like Novak, Nosram, Mtroniks, LRP, Hitec .... and ALL Sanwa, Airtronics, KO etc etc.
So, to cut a long story short.... it will work... trust rcprix