Door weather strip inner left/right question

[Jean]

http://www.realoem.com/bmw/showparts.do?model=1113&mospid=47309&btnr=41_0948&hg=41&fg=40&hl=8

I need new weather strips, but I don't know exactly what the difference is between these two.
Do you need BOTH pairs?

Both are for up to 8/87 cars, but how are they exactly different? Are 273/274 black or chrome?

01DOOR WEATHER STRIP INNER LEFTSCHWARZ109/198751211953023$35.65
01DOOR WEATHER STRIP INNER RIGHTSCHWARZ109/198751211953024$40.12

AND

03DOOR WEATHER STRIP INNER LEFT109/198751211906273$9.57
03DOOR WEATHER STRIP INNER RIGHT109/198751211906274$9.57

The ones I have in the car are 023/024 and they don't seem to fit right?

[Jean]

Ok, so here is the difference for those who care.

023/024 are pictured above.

Here is 273/274 "door weather strip inner left/right"





and 055/056 "door weather strip outer left/right"

[Jean]

And the 51 43 1 952 018 are black "decorative strip" for the rear 1/4 panels.