Missing under piece to bumper/front lip?

quicksilverCC

So over the weekend a friend of mine put my car up on a lift to fix and repair the lip from various scuffs and scratches. He did an amazing job painting and sanding it down but we both noticed that under the bumper there appears to be something missing. The lip is completely flimsy and offers no support at all. He noticed stress fractures in the paint from the wind and lack of support. It appears that the person before me must of really F'ed up the lip by hitting it and losing the huge plastic piece underneath. There are clips and holes underneath designed to be attached to something. The previous owner probably saw the huge piece on the ground after screwing it up and just ditched it. There is even a zip tie holding up a piece of plastic underneath. I wish I saw this earlier when purchasing the car but it's whatever, I still would of bought it. The car has no accident records. You can't notice it unless its on a lift.

There doesn't seem to be any other damage. We ended up cutting 4 metal strips and bolting them to support the lip when over speeds of 55 mph. So far it seems to help but I want to get the actual piece put back in to avoid any further complications.

My questions is this, does anybody know where I can get this piece?