Most dealers aren't enthusiasts, so I would cut them some slack if they don't know a part by the same name we know it as. Their parts system extremely vague + German translation = some stupid name given to a logical part.
For example - K03/K04 turbo outlet gasket. Fairly simple and a common part you'd think, but on my invoice it showed as "Pressure seal".
Luckily I've known my dealer for 25 years, so my standard drill is "MF07 UGN, engine main page, cooling system sub page please mate....." and I just point at what I need. Next day delivery and automatic discount for me too
Oh and something else I discovered recently, don't go by internet part numbers. They expire and change frequently.