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I'm no expert on stampings but that sure looks like a BL rear that was restamped to BE. The date does not really fit into any kind of COPO car range either.
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Not really sure could be I just pulled it out of my car, has two e's what is the second never seen it before lower and sideways the top of the E next to B is faint on top over the roll of the tube, so is the 0's and the 2, the lower sideways E is more along the tube and crisp, and my car is no copo, the date on casting is I-18-8, what ever it is it's going back where it came from when I change the gears out and clean it up