I have a December 2017 MX without PUP and is looking at adding a “Topfit Cabin Air Filter includes Activated Carbon” HEPA filter to reduce the amount of dust getting in the car. I just wanted to know if the car already comes with the plastic part holding the filter. I did not open the Frunk to check but wanted to make sure I did not need any additional parts. Topfit page talks about "Replacement filter" but some YouTubes showing the install of Tesla's filter appears to show that the plastic holder is present and empty.