I replaced the 'skirt seal' on our 03 Contessa last year. I found the rubber strip on line for about $40 delivered. The easier part was removing the existing pop rivets that hold the stainless steel strip in place, which then holds the rubber seal in place. I cut the stainless strip to facilitate the installation. If I left the strip as one piece it would have become almost impossible to use the contact spray glue and position the full length of the strip without messing up the glue job. I just added pop rivet holes on either side of the cut pieces.
The hardest part was installing the pop rivets that are behind the 2 long bay compartments that come out with the slide. The rivet holes near each end of the slide are not difficult but I could not reach the holes near the center. I enlisted the help of a younger more agile, thin friend who crawled under the slide and reached the rivet locations from the there.
The job took most of a day but has held up very well.
Good Luck!
Paul