The site is 'Bosch Automotive Tradtion' (kinda like our own BMW Mobile Tradition).
http://www.automotive-tradition.de/en/wissen/ausruestungslisten/frameset.htm
Select Passenger Cars, Manufacturer = BMW. Search. Then treasure the list of 210 PDFs of Bosch OEM Equipment lists for 1500s thru 1502s (and everything in between, and beyond).
When folks ask Bosch Part# Qs on the FAQ, it's a pretty easy lookup to get the DEFINITIVE info - year, model, etc. type answers from there. So bookmark it. ;-)
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That being said, I don't see an OEM BMW 2002 model entry for your cited Bosch dizzy part #: 0 231 168 021 (JFUD4). The closest number I see, 0 231 168 013, is listed as being for a US bound, Automatic BMW 2002 manufactured in Nov 1974. (and 0 231 168 017 is listed as being used on a 1976 320 and 520 4cyl).
So maybe your dizzy is a replacement model - or maybe it was an OEM Bosch dizzy for another car/model. The one sad thing is the PDFs are unsearchable, scanned bitmaps - so you may have to open and view lotsa files to look up that part number. (But hey, the info is invaluable nonetheless - kudos to them). Just look under the "Zundverteiler kontaktgest" section of the files for dizzys. Have Fun!
Hope this helps,
Tom