Really Ken? I've found the crystals from the old (black) rxs and new (blue) rxs are compatable? For example, I had my SSE on a blue rx with a 49 when crystal. When it died (RIP) I switched the crystal to an old (black) rx to use in my profile plane. Will this really cause a problem, we have so many old/new rxs that swapping crystals has become common place at my house.