I got hold of some Marvic Penta 1's about 5 years ago, the front had the Corse hub the rear was standard road. The front was larger disc PCD as well as different offset, front spindle was only available in titanium and as you can imagine was very pricey, this may be different now as it was 5 years ago, you lose the speedo drive too, obviously only a problem if you use it on the road. I swapped mine for a road front and I agree with Felix, steer clear unless you're prepared go the whole hog
