Well, when I was looking at the filter I was turned around. The arrows were pointing forward. The job is pretty easy. All I needed was an 8 mm or 5/16 deep socket and a 6 mm socket. The filter had been previously done and had the Euro style non-perforated radiator clamps on the hose. I had done the job once before on a car with the M54 engine but didn't remember it too well. Next time will be easier.
It's not Poke-a-Yoke, it is possible to put the early style filter that goes with the M52TU engine in backwards. The ends are similar. The discharge though is stamped "Auf" and that is for fuel going toward the injector rail.
Fahren in seiner Äußerst Form