Your engine was orginally purchased by CAI in Louisiana, it is in fact a mercury 'B' version.
We have Merc 'B' shafts in stock if you wish to purchase one and/or other parts are available.
Contact Russell Adams at this phone number 1-888-894-5387
or this email Radams@usmicrojet.com
He will need your credit card information and can give you a total for shipping the shaft to you directly.
US MicroJet LLC
900 Glendale-Milford Road
cincinnati, ohio 45215