hi ,i have anoverlander breeze 40 size eptrainer can you tell me if futaba s3003 servos are compatible with an ar6200 spektrum dx6i rx

If you physically modify the Futaba connectors so they will mechanically fit, yes. This usually involves sanding or cutting off the key flange on the Futaba servo connector and then chamfering the corners to match whatever receiver you are using.

thanks for your help Rodney