That's a pocket item in any junkyard really, I think it'd be hard to find just that item new online without months of waiting and searching but you could get lucky. I'd gently pull off another one and look for a P/N to google, then keep browsing.
That trim might be part of the whole cap assembly also...I've seen some where they just pop off the pull strap because they were held on with snaps like you'd find on a coat or a jacket.