i bought espo 1" over leal springs for my 70 road runner,found easiest way to install was loosly mount the front of the leaf springs with the one through bolt,leaving the back of the springs on the floor,rolled my rear under car and bolted the U clamps on each side,with a floor jack i jacked up the rear and bolted up the shackles,although they appeared slightly leaning forward once everything else was mounted they relaxed and i loosed jounced and retightened. i can take some measurements if you need,my frame is original. good luck Darren