I have a 1985 204C. My chines are 52 inches apart. You need to place the bunkers inside or outside of the chines. The edge of the chines should not rest on the bunkers. I just bought a new to me trailer and decided to place the bunkers outside the chines so that the boat would ride a little lower on the trailer. My center to center distance for the bunkers is 57 inches. Even after all of the measuring my trailer guy still had to do some adjusting once the boat was on the trailer. Good luck!
