I have a GuanLi Single Conversion Receiver, Futaba shift, high Channel (or so the vendor said).
Now I need to find a source for Crystals. The receiver appears to take a "standard" profile crystal (same size as my Futaba crystals). I don't seem to find this size crystal in single conversion (all appear to be mini or micro size).
Any advice?
Thanks

You should contact Performance Devices. They offer high quality 3rd party Tx and Rx crystals for a very wide range of manufacturers:

http://www.performancedevices.com

If you e-mail them with as much information as you can, they should be able to hook you up.

Not sure if it will work with that RX but Hitec single conversion are standard size.
I know this because I got my crystals mixed up and put the single conversion one in my dual conversion RX.

Yup and I've used the Hitecs and the Corona crystals interchangably too.