Door Window Weatherstrip

[elkniks]

I am looking around for replacements for the door glass channel at the backs of the doors. I found a part number on Precision Weatherstrips website, but it shows one part number and that it can be used on both doors. How is this possible? The piece has a little rubber dowel that fits into the cut window frame and a screw hole on the other, with the glass running in between. Anyone ordered this part before? I ordered a set from Motor City K5 that show a left and a right.