H8PVMNT is totally correct.
i used my stock 85 rears for my ruf pack mixed in with another 85 rear pickup pack.
the top 3 main leafs are stock 85 4runner and so is the 4th leaf.the 5th and 6th leafs are a cut down 3rd leaf from the 85 pickup pack.
total is 6 leafs.no aftermarket leafs. overall it turned out nice,they sit almost flat and flex like a champ. running 37s and trimmed out the fenders about 2 inches. also have sky offroads boomerang shackles so it clears the body mount under full compression. bumpstops are they key to this swap if u want a low rig with big tires.
the stock toyota leafs are already old and worn. u dont want to wear them out more by negative arching them.