it's a mystery...

[leggy]

Oh its a mystery...
and I dont think Toyah Wilcox can help cuz she was more in to driving horse driven chariots than Audi's!


So Guys, it's over to you please...
the photo below is of the area between my B4 80 ABK air filter box and the 'Audi' embossed silver block thingy (not sure of its name but the throttle valve adapter is above it at furthest end as you look in to the engine bay) ->



At the bottom of the photo there are two L connector grommets; one has a breather pipe in it which connects to another L connector grommet at the nearest end of the air filter box (can't be seen in this photo), the other L connector grommet is empty.
At the top of the photo you will notice a square tab sticking out of the air filter box with a hole in it.

Found this diagram but as you will see there are no L connector grommets or square tabs with holes on the air filter box:
http://audi.7zap.com/en/rdw/audi+80+.../129-129022/#2

Now I did find a piece of breather pipe laying on my engine tray a while back but reckon I must have chucked it as it's not in any of my spares boxes, it was the same size as the other one though, so I'm wondering if this had perhaps fallen out of that now empty L connector grommet or not? -
if it did fall out, well where does the other end connect? I cant see/find another L connector grommet on or around the air filter box (or maybe I'm just not looking in the right places) so can only assume that it must tail off through the tab hole?
if it didnt fall out, well should the additional L connector grommet be empty or not?

Hoping that someone can help me solve this mystery please?