this was my reply to Audi specialist in Germany:

Hi Norbert

I looked on the casing on which u bolt the senzor (plastic tube) and there are few other numbers:
BOSCH
Durchfluss
0 280 217 804
Audi 077 133 471 D

regards,

Daniel


this is his latest DISCOVERY:

Hi Daniel,

the audi-number is 077133471D ...!!
Price: 233,24 € incl. tax

kind regards

and all the best for the new year for you and your family



norbert gall



Mit freundlichen Grüßen

Norbert Gall

Teile & Zubehör


So, basically, they play dumb until you buy uneccesary casing which u already have...I mean they bolt sensor on it with torx screws , so it shoudld be sold separately..
well, for now I have their price, and waiting for check from UK,65 Pounds which is half of german price (probably sensor only)

Twilight zone ....