Depends on the connectors.

If they have the blue 'Z' connectors they'll plug right in - if they have the old-style black Airt connectors you'll have to rewire and attach new plugs.

(old-style Airt plugs have their '+'and '-' lines reversed.)

Check the Fatlion site for more info: http://www.fatlion.com/sailplanes/servos.html