Lowe's has a pretty good selection in different widths, thicknesses, and styles. My hatches have been through 2 1/2 years of hard use and the gaskets are exactly where I stuck them, even stretching and forcing them to bend around the corners. They'll be in the isle with all the door seals and thresholds.looking for suppliers with large selection of gasket materials. Hard to find. Adhesive backed U shape, maybe 3/8 wide X 3/16-1/4 high when new and uncompressed.