Rob, is it a Redcrest or a Redstart? If it is, they won't take the weight of a 5hp. Rated to a max of 4hp from memory,and it can get 'interesting' trying to stop a 4hp 2 stroke trying to shove its prop under the boat.This is down to the boat flexing, not the bracket moving.
It's shaky even putting a 4hp 4 stroke on there because of the weight.
If it's an old style Redstart or Redcrest, this will fit:-
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