Man - that's wierd. Have you called local parts stores? Autozone, Napa, Advance, etc? I have to think monroe offers something passive for very little money. Try pm'ing Krashed989 - he's on here a lot and I believe he did a passive replacement on his Eldo (think its a mid 90's model).
Also - have you tried delco's website? You can enter your VIN and see if they offer a passive replacement. Good luck. There has to be something out there. If not, then I recommend Arnott Industries - about $300 for a front set I believe, and they have provisions to avoid ride control codes.