We changed the main headlight lightbulbs today (standard lightbulbs) and for the most part, were quite successful. However, the one issue we did have was on the passenger side....we managed to break off the tiny piece on top of the plastic light bulb cover that snaps on/off over the light bulb and looks like an octagonal plastic cap (under the hood), and it no longer is fitting securely. I cannot seem to find this piece online at all. Can you purchase just this piece? I don't need a whole headlight! Does anyone know the part #?