Futaba Fasst receiver choices

[xanadu]

Hello. I have not been here for a few years. I have a futaba fasst 3pm transmitter. Will the 6 channel receivers bind with it or do I have to buy the 4 channel receivers? They are hard to find but ebay has lots of 6 channels. The Futaba charts all just show the 4 channels (maybe 3) as compatible. Thanks.

[AscotConversion]

I'm pretty sure the 6 channels are considered aircraft use, which most likely will not bind. Futaba seems to keep air and surface separate.