Thanks, guys.
Jim, I've got two out of four with the rubber hanging. I could try something like trim adhesive, I guess. Might be worth a try vs replacing otherwise good looking trim (for other pieces which might not as mine). Thanks for the suggestion.
Wayne, thanks for the pointer. I may just contact them. As luck would have it, while it's the rubber problem up front, the driver's side rear is marred. If I can swing a deal for all four wheels to have decent spares on hand, even if Jim's suggestion works for me for now, might not be a bad thing, as these parts are getting really hard to find. (I had to track down an entire steering column for a turn signal yoke a couple of years ago.)