Sparky, Here's the same style door lock retainer that's on my truck. Link

The filling Station also sells a universal lock retainer clip Link

Notice that both have a smaller portion that shows on the outside edge of the door. Yours appears to be much bigger there, and enough to lap under the latch plate.

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.