The original connections were flare joints, later models had the O-ring. The expers here could tell you what year steering box had the O-ring fitting, I frankly don't remember. Pull yours apart and check it out, I bet it's a simple flare. I treat connecton of the steering box flare fittings like those on the brake MC or any flare fittings for that matter. Keep the flared pipe fitting loose, but firmly and evely pressed into the female connector so it doesn't get crooked and gently screw in the nut. Whether the MC or the steering box, every time I've tried to short cut it using the nut to pull the pipe down into the fitting they seem to get a bit crooked and leak or you take the chance of cross-threading the nut. Let us know how you resolve this leak problem.I heard that there was an o-ring seated inside. Does that need to be replaced??