Door brake/stay confusion??

[pundit]

My driver's (RHD - Australia) door stay/brake busted the other day. I had the option of ordering a S/H one but opted for new as I don't wish to replace it again in a few months. The confusion lies in the part no.s for these things.
(BTW - they are the same part for both doors)

As fitted to my car - 5121 1934 020



Listed as replacement part - ITEM 2, FRONT DOOR BRAKE, 5121 8155 698


Part actually supplied by dealer - 5121 1938 876 (Note figure 8 style hole and pressed in bush)


The new part differs from the door brake fitted to mine due to the roller being wider...


... the length of the arm which is about 10mm longer at the first detent posistion and the figure eight hole in the end of the arm with the pressed in split bush. The strange thing is the only part no the dealer who supplied the unit can come up with on their system is the 5121 8155 689 number. Both my original no. 5121 1934 020 & the no. of the unit THEY supplied 5121 1938 876 doesn't appear anywhere on their system. So how can they sell something when they can't even locate a part no. for it??? The dealer is contacting Munich and sending them my pics as they don't know what's going on themselves.