The part number you have listed thats on the 'star thing' is for the oil pump gear ring i would assume. The reason this does not come up on ETKA is because this is not available to buy seperate from the crank (never has been) and was just used as a reference number during production.
These are all the crank numbers, hope this helps mate.
030 105 021 BB = AAU, HZ, ACM
030 105 021 AP = 3F, AAV, 2G, NZ
031 105 021 AC = PY
031 105 021 J = 1W
031 105 021 L = 1W