Wanted dual conversion receiver crystal (channel 42) 72.630mhz FM PPM, for hitec receiver.

aj

Instead of waiting for the specific combination, one option you can consider is the Corona receivers which are synthesized and shift-agnostic. 

Just a suggestion   

Thanks Anwar for your suggestion. Actually i bought one hitec dc receiver but i did not get ch#42 xtal. I did not realise that it would be so difficult to get a dc-rx xtal of a desired frequency.
I don't have any experience with synthesized receivers, so little reluctant to use. are they reliable and safe to use? I may consider one for my next plane.

aj

We have people using Corona receivers on our field on foamies to 60 size planes.  I remember multiple people from Chennai reporting good things about it here. On any product, not much else can be said, nor can anyone guarantee "perfectness" 

There is some discussion about Hitec crystals here too (including sources) :

http://www.rcindia.org/wanted/reciever-crystal-for-hitec-micro-05s-receiver/