68 dart "Go Wing" and Front Air Damn???
Try Ed Quay Race Cars at http://www.edquay.com/spoilers/index.html
They offer both trunk-lid width and full-body width rear wing spoilers for 67-69 Darts and other Mopars. Here's a couple of pics from their website:
yep thems the ones, I thought I had them bookmarked. Beautiful wings but I don't think they'll help me much on the road courses so I probably won't ever buy one.