i have a 1983 16' bass tracker w/ 40 hp o/b ser#6140511 i have damaged the prop and cannont find a replacement the one that came on it is a 12.5-13 (the numbers off the current prop) i cannot find this specific prop for this motor the boat run great w/ it and would like to keep the same if possible but i donot ant to order till im sure it will be the correct fit and all also on a side note does this particular unit have a shear pin or hub , and should i replace when i change props