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I Googled "BPG Engine Fasteners" and didn't find anything. There is a company called "Brandon Products Group" that sell all kinds of industrial mounting equipment but a search of their site showed no bolts, screws, or other such fasteners. Since those are a 12-point type capscrew they're not marked with SAE Grade markings as a conventional 6-point bolt would be, but I would have to think that the 'BPG' is some kind of vendor/manufacturer identifier. Interesting...