The back hole on the headlight bucket is to big for the rubber plug that is supposed to go in there. I bought the plug but the small teeth around the inside of the hole have been eroded off.. the plug just falls out and seems to small for the hole.. what do you guys do to keep that plug in? glue it in? make a backing for it? right now i have used some caulking to hold it in but its not a super tight fit. any thoughts?