I might be able to help you out here.. I have a 4.7 and a 5.4 in our shed at the moment ( I love the Shed
) Tell me what the measurement of yours is from the outside of the transom to the centre of the bow under the tubes. Run the tape along the hull on the inside underneath the tubes and then I will measure mine.
Also if you have an email address PM it to me as I have a nifty file from searider with the specs on which I will send you.
re TFR 9.97 should cover it
HYPER CONCENTRATE TFR's
having just seen your pictures take the measurement from the outside it will be easier