What's the deal with my grill?

[67_C-30]

I have thought ever since I bought my '69 C/10 that the front looked a little different than other '69's or 70's, but I thought it was probably the color and trim, because all the other 69 - 70's I have don't have body side molding. After looking closer, I realized today that I have totally different grill altogether. The parking lights are in a different location and the stripes above and below the CHEVROLET lettering are a little wider. The parking lights are a little closer to the headlights. Does anyone know if this is an older aftermarket grill or something. My truck was restored in 1990, but don't know if the grill was replaced because the grill is the most weathered piece on it. All the body side moldings, Etc. are still very bright and almost look new. Here's some pics of it and a pic of my '69 C-30 for comparison. I have another '69 and 2 70's and they both have the same grill as my '69 C-30.