Ok mate, well its definitely not the part number you said then !
Are these mud flaps OEM extras ?
If not, then this is the only other fixing part I can find :-
N 908 214 01 which is described as 'expanding nut' size 4.8 x 19.6mm
This goes into the bodywork and an oval head panel screw no. N 910 570 01 size 5 x 16mm screws into it !
Apart from that mate then sorry 'don't know' !!!