Here's the diagram that CGRetired was referring to (at least I think this is the one)

As you can see, the Futaba has a little "tab" on the side of the plug. You can shave that off and use it with other receivers. Also, you can use other servos with your Futaba receivers. As noted on the diagram, with older Airtronics you will have to reverse the wiring.

A lot of manufacturers are now producing what's called a "Z" connector. Z-connectors are universal and you can use them on anything. The Z-connectors are actually the same connectors that come on the JR and Hitec equipment in the diagram I provided

Ken