Just as an update I did go to the dealer to look for the access door and they said it is part of the entire fender liner so to replace just the door you would have to purchase a whole new liner. The liner itself was about $35 at the dealer, I actually found the same liner online for $10 per side. Once I received the replacement liner I quickly learned why it was so much cheaper than OEM. This $10 liner was made of really thin plastic, it reminded me of a highschool plastic folder. I didn't replace it but it served for extra plastic to cut out my own access door. I ended up cutting it to the size I needed and attached it with two plastic rivets at the top and cut a notch in the bottom for the door to stay shut by snapping in place. I can't see it being a problem but if it does end up falling then I'll simply spend the $70 to replace both sides.