Have worked on 1964 Johnson 5.5 HP Model CD-21-A, fixed all the usual at some expense, then find a previous repairer has damaged a carburettor part that is NLA. I need a high speed nozzle P/N 303447 new or s/h, or a s/h carb. with a good nozzle. I believe that the same carb. was used on 1961 to...