The one that Kevinski pictured is part of the door weatherstripping that gets glued on the door all the way around. That metal strip is the belt and suspenders keeping it in place. The joint of the weatherstrip should be at the center bottom of the door under the metal strip. Here's the metal strip Jim Carter Link

There's also a piece of windlace (different from the type that goes around the front top and back of the door opening) that goes along the floor at the bottom of the door opening and is held in place by a similar metal strip. Here's that lower door windlace. Jim Carter Link and the retainer for it Jim Carter Link

Happy Birthday.

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.