I replaced the lower screw cover strip on my boat. Purchased from Steele Rubber Products. steelerubber.com. I called them about sizing and they sent me a sample pack of different sizes at no charge.
Ordered the right size and length i needed. It was a simple replacement project that took about 90 minutes. Used my heat gun set on low to soften the rubber and some diluted dish soap in a spray bottle which made the installation easier.