Re: where to get a prop
Iim looking to buy a 13 diameter with a 17 to 19 pitch
14-15" diameter sounds right as most of the 17-19P Mercruiser I/O props will fall in this range. Higher pitch props (23", etc) dive into the 13" diameter range though. If you find a 13"d prop, I'd check make sure the barrel size is 4 3/8", so it mates up the the drive housing correctly.
You need to figure out what pitch you need before ordering as a 17 could over rev the engine, while a 19 might not allow the engine to turn it's recommended WOT RPM. Depending on your boat, load, usage, altitude, etc, etc, you cold possibly need a 15P, or maybe a 21P... check out the link I posted up in my first reply.