There are basically two door/window frame designs for the CRX. The '88 had the seatbelt attached to the B-pillar and has a "longer" window than the '89-91 door which had the seatbelt attached to the door. The easiest way to tell the difference is simply to look at the B-pillar. It's much more narrow on the '88 doors.
As a side note, the '88 doors also have considerably less stout impact beams and can weight almost 10lbs less than the later doors.
Gregg Ginsberg
'96 Civic EX -- MARRS ITA #72
WDCR-SCCA Rookie of the Year 2003
MARRS ITA/T3 Drivers rep
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