P/n 12 in the above illustration is what's generally known as the alt/AC compressor mount. Due to block height changes, this bracket will not fit 351 Windsor (or Windsor-based Dart, Fontana or World) blocks, or on modular engines. So there should be a few around from the bucks-up engine swap guys. It's made of 1/4" steel plate & weighs 16 lbs. My TIG-welded copy of 1/4" aluminum plate without the idler extension weighs 4 lbs...
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