2007 headlight retaining clip-broken plastic

Hi. My 2007 Base Prius requires yearly light bulb changes. The grey plastic (housing?) that the retaining clip latches onto is missing. Essentially, I am sliding the new bulb into the metal housing with nothing for the clip to grab onto. The passenger side still has the plastic housing. Does anyone know the part number or is this an entire headlight housing replacement? If it's entire, do you have any suggestions on where to buy inexpensively? Much thanks,
Big Hands

 

Thanks. I don't even see the famous finger gouging retainer clip so guessing the clip and housing are bundled with another part or the big housing itself. Anyone that has changed these bulbs becomes intimately familiar with the clip and fun attaching it (on other cars it might be called a bailing wire). Only recently did I use a small mirror to see - low and behold the driver's side clip had nothing to latch into. Searched the plastic, "Catcher", areas under the car - no dice (though I found the bulb my girlfriend dropped).