Dirtman, you are correct. I was going by the part number in the parts book. I do remember that the 73 skies had a larger diameter loop. Possibly Polaris never changed the part number for the 73 style ski, or Polaris did make a reprint version of the 71-73 parts books and maybe I looked up the part number in the reprint parts book. I will have to check the original parts book version and see what they show for part numbers. I was surprised to see a different part number for the 1972 Colt, anyone know what is different on that ski?