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Thank you JRP. As I have downloaded the drawing I will check the size of the bracket against the room I have on the boat.
Since my boat is now at near 200 miles or so from my house, I will check against the drawing of the transom http://www.bostonwhaler.com/boat-ownership/resources/
Than I'll post my considerations.
It is funny that I am the only guy on this big forum who wants to install a 9.9 Mercury on a common boat like mine!