Didn't see this discussed after a brief forum search.

My brother's car is starting to show signs of old age. The rear passenger door handle on the driver's side is missing the black plastic cover on the proximity door lock button and the contact is exposed.

I'd like to help him find a salvage unit or a new one and replace it for him. What I need is:

1. A source for the part, used or new at a decent discount.
2. A part number or a link to a diagram of the door.
3. Links to any threads where this replacement has been discussed.

Thanks for help to any of the items above!