If you read the first page of this thread, they are talking about using newer lights since they are lo-profile, etc.
From what I can tell in the pics, the 94-98 are the tall triangle ones. 99-02 are low profile and so are the 03 and up. From what I can figure, the difference between the 99-02 and 03 and up is just were the screws are.
I'll probably just order the 99-02 ones. I can't imagine anything changed from 98 other than the light design... I hope.