OK so here's pictures. What appear to be studs hanging down from the dash are actually simple bolts inserted down through holes that I believe are on all the dash frames. They are retained by a nut tightened against the dash frame. If you don't have holes already let me know and I will get you measurements.
View attachment 1715517803 View attachment 1715517810 You put the ducts on from the bottom, there is a nut with a captured washer that goes in from the holes on the bottom of the duct set through metal pieces between the ducts. I think that the only reason the "studs" are so long is that it makes it easy to thread this second nut with the ducts in place. You need a deep 7/16th socket to tighten the duct retainer nuts.
