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I'm pretty sure you can just pry them off with maybe a wood chisel or a putty knife. You might need little plastic push-on retainers to put them back on. Be gentle though as these are just pot metal. If they're beat up at all, you really ought to replace them. Scott Drake makes perfect replacements for not much $$$. They're available almost anywhere at Mustang parts places. They are usually referred to as emblems.

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