Looking over my vehicle this weekend I noticed that I am missing the 4 nuts that hold the BACK of the undertray onto the rest of the car. Does anyone know the proper size of these bolts?

 

You mean the protective panel under the front of the car?

 

Yeah. I know the front has those 10 or so screws, but I am wondering about the ones at the back of the panel. I dont have any left for reference. I think they are 10mm, but unsure of the length or even if I am correct for all 4.

 

I thought the back screws were the plastic pop screws that are used in the wheel wells for the liners.