I have a 1963 Johnson CD-19 5.5hp. I am trying to find a fuel line for it. I picked up one that says it fits Johnson outboards and was a 3/8 inch line, but like my luck goes it does not fit this motor. It has a rectangular end and wont fit the connection on the motor. Do these older motors take a special fitting? Should I have gotten the 5/16? Any help i can get would be great. Thanks!