With the new rubber pushed into the main chrome frame and into the horizontal portion of the tin frame, we installed the short-length vertical seal in the upright portion of the light metal frame by lining up the small metal tabs with the holes in the frame. Be sure to position the seal on the window side of the frame with the wider portion of the seal facing the interior. Now bend the tabs over with a flat screwdriver blade to secure the seal. Note how the tabs fit into those small recesses. There are actually four different ways this seal can fit, but only one way is correct. Ask us how we know . . .