In addition to Mindsensors' 8 channel servo controller for the NXT, they are supporting it with a RC servo mounting kit. To make the kit best suited for your needs, Mindsensors would like the detailed specs of the servos that you want to use with it. The announcement says:
"This is a prototype picture of servo mounting kit. The kit is designed to integrate commonly used servo motors in your NXT environment. If you use specific servos, send us the specs (make/model/size/dimensions, etc) as soon as possible so that we can address your needs."
You can email them your servo specs to: info[at]mindsensors.com