After removing my undertray for service and pulling the various damaged clips (and accounting for the missing ones) I wanted to replace the whole set as they have a limited life before removal gets difficult.

The clips from Mitsubishi get pretty expensive if you want to replace 30+ of them. The OE clips have a 20mm head, 8mm hole, 21mm protrusion, and 16mm screws.

A replacement for the OE part #MB547806 is:

http://www.clipsandfasteners.com/Nis...r_p/a17472.htm

I wanted to see if I could get a little tighter engagement by using a clip that spreads a little closer to the head, Nissan #83844-01A00 looked like it might fit so I ordered a couple packs. It starts the head engagement at ~5mm, compared to ~8mm for the OE clip. The screw is also 3mm shorter (13mm vs 16mm).

http://www.clipsandfasteners.com/Nis...r_p/a16858.htm

The risk is the spread point is still in the hole and will not work as a good clamp, but the benefit is it will lock in the 8mm hole and not spin when trying to remove.

I've attached a few pictures comparing it to the OE clip.

Also, I read a lot about what a pain the OE clips can be, but I have found the best tool for removal is a 1/8"x4 flat screwdriver like the one in the attached photo. You can extract even the loosest screws with little or no pressure applied (sometimes it helps to use a dentist pick to apply some pressure on the screw).

I will be cleaning up the tray and installing it with the new clips and reporting back how it works. Pretty basic stuff but it might help someone.