I fitted a '03 seat to my '02 Adventure and found that I didn't notice much change. The fitted a 'Stich sheepskin comfort pad to the '03 seat and was again disapointed with the result.
I have just got an AirHawk http://www.therohogroup.com/recreational/index.jsp
pad which was expensive but what a result
. I just had a long weekend away with Mrs KTiM on the bike and did 500+ miles with the AirHawk and no problems at all, that numbing feeling that used to start to be felt after about 30 mins. just didn't show up at all. I'm happy