Try the Honda Tech prelude classifieds. They pop up there every so often. But the sideskirts are the hardest to find....Maybe get in contact with some JDM suppliers. PW JDM, Memory Fab, ICB. They might be able to find them for you.
A forum community dedicated to Honda Prelude owners and enthusiasts. Come join the discussion about performance, modifications, racing, engine swaps, classifieds, troubleshooting, maintenance, and more!