I believe they are just a poured epoxy into the mold. He played around with the technique for awhile. I always loved the SAP GTO grilles and front fascia extension, so I got a set.
Mine fit pretty decent, but just didn't fully get the look that I wanted, made the "nostrils" smaller than I wanted, I didn't like the attachment method, etc.
I sold mine and custom painted the front fascia and stock grilles for a GTO look (no arrowhead either). I was already having some work done, so it was free.
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