Aq275 swap with aq280?

Arthur 1019

New member
3 Feb 2019
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First Hi to everyone as I'm new on this forum.
The problem is that got boat fletcher faro with aq131 engine 4 cyl petrol which is designed to work with 275 outdrive which was missing once purchased boat. Recently bought complete 280 outdrive with transom plate etc. The question is how to adapt 280 to this engine as there is a different shaft splines . 26 splines (fine)shaft installed in belhousing but 10 splines (female) u-joint.
Any suggestions would be much appreciated. Parts needed, etc.?
Thanks in advance.