These are easy to replace on your Alpine. Takes about 10 minutes..1 screw at each end on the roof seal and same for the wall seals...you can replace one or all..
You can also order from here at a better price.
https://www.camperid.com/ap-products...SABEgIrqvD_BwE
To replace remove old seal and lay it out flat and cut new seal exactly same length ..mark on each end where the screws will go using old seal as template..
Use wife’s large scissors to cut seal and it will also cut thru the light gauge metal...
Clip seal back into place and once it’s all in track flush reinstall previously removed screws at marked locations. Your done