Ridetech Air Bag Shocks ?
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#2
http://www.airbagit.com/product_p/fbs-for-68-kit5.htm I'm sure there are other brands avalable as well
#3
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#6
Not the same thing, but user Wickedinhere fabbed up his own bag brackets. He has a lot of good pictures in the thread I linked to below. I'm sure you could do the same thing with stock beams it just wouldn't be as low when aired out.
https://www.ford-trucks.com/forums/7...omorrow-4.html
https://www.ford-trucks.com/forums/7...omorrow-4.html