The bumper cover is urethane ,the absorber underneath is made of styrofoam.The liscence plate is held on by [2] metal plates with a nut welded to it.the thread size for the bolts is 6mm.The part# for the [2] metal plates is 52121-24020 list price is 3.74 ea.order two of these from your local dealer.To install remove your lower bumper cover retainer,and weasel the two plates into place.Then re-install your tags with new screws[6mm]speedracer said: