That was my thought too. I looked around briefly and did not find anything....I also found it odd that the hole was not threaded; but smooth on the ID.
Im going to try to snake my phone down there now and get a photo of the hole. I've tried 100x to register on EPC; but it keeps giving me an error.
I may also head to the dealer and see if they can ID the part and have one on the shelf I can look at.