So I tore down my A6 today and wrote down all the numbers and letters I could find for the bearing identification. I was told that there should be 5 stamped letters on the block where the oil pan mounts towards the flywheel side. But I scoured my block and couldn't find a single marking. Are they somewhere else? I was searching a little and couldn't really come up with anything. Everything seems to be for B series. Thanks.

The markings I've got so far are:
From the crank.
B 1 B 2 B 2 A 1
2
??????

From the Rods.
2 2 2 2
B2 B2 B2 A2
Three Yellows and 1 pink.

 

the letters should be stamped on the flywheel side of the block