We went with a 17x9 over the 18x11 that came with the boat. I used the "Digital Prop Shop" to select it based upon our Westerbeke 46. Obviously, if you have a different engine with different RPM
needs, your prop would be different.
In regards to the heat exchanger, it's from Lenco. I had Cooks marine
remove it for proper fitting, they are called in the dimensions, and the new one should be arriving in the next few days. As soon as I know the model I will let you know but, again, it'll be different unless you have the same engine.
The Lenco cooler was 1/2 the price
of the Westerbeke cooler and I think is a better design.
While I am at it I am also replacing my glow plugs, getting my injectors serviced, replacing the thermostat, and also the temp switch.