I used nylon 4-40 pan head screws to mount all of my sidestrips. The heads fit easily inside the trim. I put nylon nuts on the back where I could, and glued the screws in with RTV where I couldn't. These screws are available at many home centers, Lowes, HD, etc. I'm not sure how long they will last, since I only did this back on 1977. Yes, that's 1977 ;-)). Stu