Ok, I'm glad to provide the first REAL answer in this forum.
The fenders, hood, nose piece and bumpers are very different from 88-89, to 90-91. Then, they are very different (more so) between the 4 door, hatch, and CRXs.
Lots of aftermarket people will put "Fits 8-91 Civic and CRXs." That means that they have ignored the fact that there are 6 different fitments between the years that they list.
Post up a pic of the fender, primarily where the hood / bumper and lights fit. That way, I'll be able to tell you what the fenders are for, and how to make them fit. You will need to cut / roll the fenders.
TurboMirage: Remember Greg trying to get the new CF-look fenders and hood to fit ? He's now got a complete Civic front end on his CRX to make it all fit. The goal was lighter front end, and his fenders are Z3 vented.
You may, if you want it done right, have to buy a complete front end for the car. I know Greg took about 1 month to get all of the pieces assembled to fit. Civic hatch hood, hatch fenders, and hatch bumper skin. Then the skin was modified to fit over the CRX bumper rail. Lights had to replaced as well.
-> Steve