If you decide on napa brand just get the cheap ones (es2332) they are the exact part as the more expensive brand, mine even had the expensive part number on the tag inside of the box. And if you don't believe me, I work there.
I looked on the Napa website, only saw the one item for es2332 that was 30 some bucks. Is that the one you're talking about? That treadsaver part was only $10, that's why I was making such an effort to find one.