You might be able to make these look a little nicer with some silicone weatherstrip dressing. You can buy this product from any GM parts counter, or gmpartsdirect.com.
Part No. 3634770 is pretty expensive,
Part No. 12345579 is less expensive, but if you buy from gmpartsdirect, you have to buy a six-pack.
I haven't used 3634770, but I have used 12345579 on my 1994 Camaro's weatherstrip. Just applied it, let it set a bit, then wiped off the excess.
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