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Check out Doorplugs™ at www.bumperplugs.com. Another route would be to buy an Autozone - Dorman type black trim plug that will cover the lock circle and fit nicely in the recess and paint it to match body color. Some careful trim work and fit up of the push in portion might be necessary to attach to the lock slot, or use an adhesive to keep it in place
Have you used these door plugs? I got the bumper plugs 2ish years ago and they were a perfect match and worked great...