Well, the older (2000) blaupunkt in the car right now is the the standard ISO.

The becker 3302 is also ISO-

Here it is- click on harness: http://beckerautosound.com/3302-1999/1ndex.htm

So the head unit should hook right up.

__________________
'90 300SE 298k
-300K and it gets put into retirement.
'80 300D 255k Purchased new by family in 1980.

Had a:
1973 220 (gas)
1980 300SD
1992 400E