I ordered them from the Western Chassis website. Install was easy. I went with these so I didn't have to cut the support for the shackles or go through the trouble of grinding rivets and relocating the hangers. You could purchase the 3" drop leaf springs and remove a leaf to drop it to 4 inches if you don't like the stance. It didn't quite get me to 4" of drop but I'm pleased with the results. I'll put a link below
https://westernchassisinc.com/1973-8...-Leaf-Springs/