IIRC, the valve bodys changed from year to year, as did some other details, the swap candidates were something like :
97 with 97
98 with 98
99 - 00 with 99-00
01 - 02 with 01-02
03 with 03.....
I could be completely wrong though...... 01 or 02 got the hardened 4th hub and other various upgrades, so I would suggest those if applicable.