808 means 1988 model year.
If your car is before 9/88 it should be 5944 Fregattblau
If after, it should be 5301 Andorblau
from here: https://www.w126-wiki.de/index.php?title=Lackierung_und_Polster
Code will not be listed on the data plate as all 929 cars got the same cladding colour, you...