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I've got these. The ones on the left are from a '63, the ones on the right are from a '64. These '63's are ever so slightly different from yours. Both upper ears are closed on mine where as one is open on yours. The '64's look a lot different but might work. If you compare them side by side the critical retaining points all end up in the same place. looks like the '64's might have more secure retention, maybe an improvement over the '63's? I've currently got a '63 Starfire parts car, could see whats on that for clips. $3
per clip plus the shipping if you're interested.