Undertray bolt size?

[MikeKey]

My undertray has been sagging in the middle for a while now so I've just had a look what's going on.

I found that the bolts holding it to the bumper and wheel arch liners are all fine, but all the bolts that are supposed to support the undertray itself are missing It looks like there should be one going into the crossmember, and maybe a couple more.

Can anyone confirm how many bolts there should be, and what size/sort of bolts they are so I can get some more?

[White Lightning]

They are not bolts, they are plastic clips.

And there should be 14 fixings:

3x into the centremember
3x into the drivers side engine plastic
2x into the passenger side engine plastic
6x into the front bumper (two of which go through into the bumper bracket)

[MikeKey]

I just robbed a clip from the passenger side that didn't look like it was doing much and used it to clip the center of the undertray to the crossmember, so no sagging for now at least.

I can't see where some of those clips you mention would go though. I only found one hole in the undertray that lined up with a hole on the centre crossmember, plus I have bolts securing my undertray to the bumper and wheel arch liners.

Anyone got any pictures? I don't have much access under the car right now so it's hard to see