http://www.uxcell.com/pcs-plastic-metal-t10-light-cover-protector-for-car-exterior-p-122329.html Obviously after market
Above LED light could be used to convert the seatbelt mount hole into a courtesy light (wired to the lower door light), for anyone changing their door mounted seatbelts to Auspec or going the other way. They are inexpensive enough, might be cheaper than a rubber plug.