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Not exactly what you need, but I've got dozens of these two sizes. All NOS from the 60's. My dad used to manufacture and upholster furniture. These have been stashed in my attic all these years. Look like standard 5/16-24 thread. The shorter ones measure 5 1/4 length x 1 3/4 at the wide end x 7/8" narrow end. Long ones are 7" length x 1 5/8 wide end x 3/4 narrow. Stamped made in Japan. If anyone wants a few they're free for flat rate box postage.
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