Anyone know the part number of the rubber cap under the body near the rear passenger doors. There shoud be 3 rubber caps on each left & right side so total 6. I'm missing one of them.

 

take a pic i have no idea what ur talking about lol. Then i can help u locate the part.

 

You might try
OEM Genuine Honda Parts at Discount Prices
Enter your type of fit and try the section "GROMMET (FR.)"

This will take you to Genuine Honda Replacements Parts

If you can't find it there, try one of the other categories. Finding the correct category for your part is a little difficult sometimes.

 

please try to post a pic of the plug and where it goes, i found a rectangle rubber plug about 2''x1'' laying in the back with the spare and was wondering what it went to, could this be it?