I was wondering about that a few months ago but never bothered to search for it, so thanks for the part number.
However, I'm temporarily running my stock intake again and just tossed the foam since it was torn up. Doesn't make a difference with it gone from what I've observed. There is no rattle either at idle or under load, and as long as the bolts holding the intake are tight and the clips for the air inlet aren't damaged, I don't see an issue driving without it.