From the Mustang 302 forum depicting the air cleaner of a Boss 351:
http://www.boss351registry.com/Car-Images-2/Detail-Engi...rticle/Page%2064.jpg
so, on a Pantera, should it be "front", a parts number, an autolite sticker, maybe a Motorcraft sticker...interesting (to me at least!) that Ford affixed multiple different stickers to the air cleaners on 351c cars....
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