for 1999 a4 stock color only two different blue exterior ava:
Blue, Pelican Metallic or Blue, Santorin Mica, the pelican metallic blue has cool shade, which is more expensive than any other stock color.
for 1999 a4, your paint code is located in the trunk.
P.s. i think the color is metallic blue

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ok thanks

 

You have a early 99 the 99.5 is way different.....