Side panel mounting screws & grommets: 07 EC 300

[Gregarious]

Least favorite aspect of my EC 300 so far: side panel mounting.

The head on one of the plastic screws was broken off, so I had to drill it out - destroying the plastic grommet in the process - to get the panel off.

For reference, the side panels have 3 connections each: 2 x 7mm hex head screws which are also slotted for a flat head screw driver, and 1 x grommet and plastic screw. The 7mm hex heads are accessed from the forward-facing side of the subframe, whereas the plastic screws/grommets are access from the back-side.

I looked through the parts diagrams on GoFasters, but couldn't identify what part number I need to replace. The "plastics" diagram doesn't even show the side panels. Does anyone know the right part or a suitable replacement?

I've attached a picture of the grommet - with a key for perspective.