I have an old, detached, two-car garage whose doors are one-piece metal slabs. The door sweeps were flat rubber strips with a bead along the top edge. They were inserted into metal strips that are permanently attached along the bottom edges of the door fronts. (See the attached images.) These old sweeps have crumbled away, leaving 1" - 1.5" gaps along the bottoms of the doors. Leaves and dirt easily blow from the alley into the garage through these gaps.
I cannot afford to replace these doors at this time. I am also not willing to spend a tremendous amount of time or effort on a solution.
If anyone can point me to a replacement source for the rubber sweeps or has a brilliant idea for a substitute, please post it!