Request help locating part number

Greetings! I recently purchased a 2007 WR250. While doing some maintenance on the bike, I noticed the engine guard is missing one of the metal bushings/grommets that protect it, and its hardware from the frame.

The Engine Guard is part number 37 on the "Frame" section of most OEM parts sites, and the associated bolt that goes through the spacer is part number 38 on the same diagram. The OEM parts breakdowns do not appear to list this grommet separate from the engine guard, and the part does not seem to match any of the other body grommet hardware on the bike. It appears to be made of aluminum.

If anyone has a recommendation (part number/link) for an acceptable substitute, I would greatly appreciate the assistance!

Measurements for the part are as follows:

Outside Diameter: 17.6mm
Inside Diameter:     9mm
Thickness:              4.91mm

Will

The WR250R was first produced in 2008, so do you have the year wrong, or did you buy a WR250F?

You are absolutely correct. My bike is a WR250F. I ended up building a replacement from a bronze bushing purchased from a hardware store. The dealer is also unable to locate the part without purchasing the entire engine guard. Thanks!!!