We bought a 40 year old house. I took apart the shower frame to clean it. The old L seals on the sides were disgusting so I took them off don’t an easy task). I finally found replacement L seals but it’s been so many months (we’ve been using the other shower) that I can’t remember how the heck the seals went on in the first place. Any ideas? (Both sides are two pieces. The shower door has no metal on the sides of it.)