See my other wheel posts. On my FSE 450 I am now running a 17" DRZ rear wheel and a 17" KTM front wheel. The KTM front required bearing and internal spacer changes. The DRZ wheel just required the cutting down of the external DRZ spacers.
Important things to look for in using someone else s wheel is the distance from sprocket to rotor on rear wheels and bearing size. If its close, it can be made to fit. For front wheels its much easier since there is no sprocket to worry about and just about anything can be made to fit. However, the thing to remember about front is that some of the GGs use a 25mm axle, for those only the Husky or KTM front will work.
Tony
