I can't find this part for my 68 chevy HELP!!

[MISTERSHOTGUN]

I recently saw a 1968 Chevy stepside show truck that absolutely floored me. The art work alone on this truck probably cost a great deal. The front of the truck looked much wider than mine so I asked what he did. After he pointed it out, I realized that it should have been obvious. He removed the front Chevy emblem and took out the turn signals. Behind the upper and lower chrome grill loops are long riveted in sheet metal pieces. The top one is smooth all the way across like the manufacturer intended. However, the bottom one has pockets for the turning signals to sit. He had replaced the bottom one with another top piece and the entire front of the truck is now smooth all the way across. The problem is that I can’t find one of these pieces. Do any of you guys know where I could get one? p.s. Don’t say junk yard cause I have been to 6 of them… I would be willing to trade extra parts..
Thanks
68 chevy pu