I just did a quick search online and it looks like the 97/8 and 99-02 are different. I know they switched from the 2wd option to A4x4 in 99, but I am not sure what differences there could be between the T cases. I would check out
http://www.car-part.com/ and see what you can find there.
I'm not sure how mechanically inclined you are, or if you are planning on even doing it yourself, but I pulled mine this summer. Its pretty straight forward. Pull the front and rear driveshafts, pull the cross member thats in the way, there is an electrical harness, and 6 bolts that connect it to the tranny. After that, slide it back and it will drop out. I had mine out in about an hour and by myself. Its not too heavy, but its kind of awkward. Hopefully you will be able to figure something out.
Zerick