Starr,
I wasn't aware that spare parts kits were available. The Tugnuts site has a link to the spreadsheet with the list of parts for your model of boat/engine. The spreadsheet lists filters, zincs, etc. we can purchase directly from the Ranger Factory. I will be first to say that Richard and the team have taken VERY good care of us. Love this service! Just another of the many reasons we love our Ranger Tug.
Don