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The OEM RPO code is at the left before the color name. If your car still has the "Service Parts Identification" sticker (also called the RPO Code decal) The color code will have a letter U or letter L after the code. The U stood for Upper and the L for lower. The early C4's had a two tone paint option so the U and L referred to the colors.
At the bottom of the sticker, there will be a "WA" code of 4 numbers.