When I got mine last year, I started a post about this very same thing. old post The one you have is a TRW replacement arm, lifetime replacement warranty from advance auto. It is the one in the black and white pic above, it just doesn't look like the drawing. It's the same one I bought. It's been fine on my truck, except for the fact that the previous one I had on there (previous owners, and a TRW also) went bad in a way that is not normal for the much stronger toyota arm. It went bad (started wiggling, showed excessive play) in the area in your picture where the nut is. The bottom arm would wiggle in a way that was obviously not good, so I replaced it w/ another TRW. I figured since it only took me 20 minutes to change it out, I don't care if I have to do it even once a year for that price, hell, 50$ for 2 or 3 idler arms isn't bad!
Jason