dimensions of a small block balancer

i know that this is an old thread but i just got to this point on my build and would really appreciate a follow up. i have a '72 318 with power steering so i have a two groove crank pulley. does anyone know of a pulley i can get that will work with my genuine fluidampr?? i measured roughly and the fluidampr is about 5/8" longer from the seating surface to the pulley mounting surface. thanks in advance for the help :prayer::prayer::prayer: