Hi. On my Extra 300 the alierons are moving the same direction. The servos are mounted the same.
I just can't figure it out. I have the DX7 radio and I don't see a way to change each servo individually on it.
Any ideas?
Thanks.

Just flip one servo 180 degrees in the servo mount.

Are you using a Y harness or are they plugged into separate channels?

If they are plugged into separate channels just reverse that channel

Barracuda is correct...next time when you mount aileron servos if they are on their sides, then opposite of each other..ie....both facing outboard or both inboard...if they mount flat then the servo arms need to be opposite.......that is of course if your using a single channel for ailerons......if dual channels are being used then reverse one servo on the correct channel to make the ailerons move correctly in relation to the stick on your transmitter

If you are using Flaperons, then check the servo direction on channel 6. If you are using a Y harness, then you have to get a "reversing" harness. I have a DX7 and went through this same issue on my Frenzy.