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If #1 is the same manufacturer (and the same part) as OEM, it's probably what I'd do. Generally they are good quality, even if in your case there was a crack (which may have been spontaneous or a result of some earlier forces or something applied). Identical item for half price. Chances of an issue maybe 1 : 100, maybe 1 : 1000.
The all aluminum sounds great if you don't care much about cost (seems like you do), or if you're racing and need an upgrade (unknown).
Straight OEM I might skip for the needless cost increase.
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