Yes, you can. You can generally purchase individual pieces of our kits. Click on the kit on the main catalog page to get to the kit product page, then scroll down to see the individual items. Here's a link to the door seal you're asking about: https://www.fehrcab.com/sih186-rh-door/
. Please note: this is the seal where the door closes against the frame, it is not the seal that holds the glass in the door.