Wanted singal conversion receiver & receiver crystal  40.665mhz . 40.770mhz  FM , for futaba receiver.
                                                               
                                                                           

Oooooh, I got some, but they are of 72MHz. 

Are you looking for either one of these frequencies ?

yes
basically i want recevers

Obviously, you have not posted your query correctly   In a situation where even one channel difference renders your setup useless, one has to be very clear on what they are looking for !

Have you considered the Corona receivers ? Multiple stores are carrying them.

i have problem with the Corona receivers 

Please elaborate. It will be useful information.

A few folks are using them regularly at our field with no issues. They may not be perfect, but well usable is what I heard. 

I have one, planning to use it on the next foamie.

QuoteWanted singal conversion receiver & receiver crystal  40.665mhz . 40.770mhz

Never heard of 5kHz separation. Could be 40.775 MHz. Do check.

They do exist, across different countries. But within those countries, the separation is always higher.