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Did mine on my 03. I had a little "fade", the area under was a different yellow than the rest of the car and bugged me for a week or so. After a month, it all blended together. My guess is that the area was not affected by UV rays, and it took a month for the color to change to match the rest of the car.
Keep your BSMs, you always want to keep your stock parts for many reasons. They would cost 150+ painted if you ever needed them again.