what piece is broken?.. the latch at the front of the armrest.. to open it up?
this part?.....
The part number for that latch is 202 683 00 84 (there is also another part number printed below it.. 202 680 11 84.. hopefully one of them is the right one.. plus you will need to add the colour code of your interior to the end of that).
or if you do need the entire armrest lid (with the leather on it) the part number is 202 680 06 78 and you will have to add the colour code for the interior to the end of that as well.