hi, I have misfire on cylinder 2, and it seems it's the problem of ignition control unit. I know it's an easy replacement so I tried to look for available parts. now I am confused. I have two part numbers for ICM:
8D0905351
4D0905351
Which one would work and which not?? is there a difference? some sources say to use the first one, others oposite. by the way, I have 1998.5 a4 1.8T quattro. Please advise!

 

its probably written on yours if you just pull it out.