It isn't supposed to have ailerons. It's just a 3 channel (elevator, throttle and rudder). You got the one advertised on the page. I see it comes with a 4 channel radio. You may be able to add ailerons...

Specification
Wing Span: 1295mm
Overall Length: 940mm
Flying Weight: 1200g
Battery: NI-MH 8.4V/2800MAH
Power System: GL-540 MOTOR GEAR
RC Contrlo System: 4ch TX/RX, 2X32g Servos, 1 ESC
Colour: WHITE

Ummmm just exactly what kind of replacement parts are you looking for?