My 1966 Sea King 45HP(made by West Bend) uses a Tillotson carb. (OM20A) is the only serial number I found on the carb) I need to get a carb kit but when I went to Napa the only kits they carry are for Crysler/Force motors and they dont specify years in their books. I wrote down all the model carbs their kit carries but mine is not listed. Are all Tillotson carbs the same or what?