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Thats exactly what I did. Do a intial install with no paint and then paint it. Then when you go back in you will be more cognisant of the piller and will be less likely to damage your paint job.
I found my Grey at NAPA & it was an exact match. It's called SEM Color Coat Flexible coating & Pn# 15163. They let me take several cans of gray to my truck to match up.
I still have a full can, it doesn't take much.