You need to weld in the holes for the "shocks". Then acquire the "Pre-L" bumpers (front) wiothout the lenses, as you have the turn-pods, or fill in the turn pods (more welding).
Rear just weld in the holes.
see the bumper article for images...
http://www.geocities.com/provamo72/Tech_Info_Main.html You save maybe 200 pounds, and spend ~ $1,400.
Chuck