I just purchased an immaculate 2002 Sea Ray 17'6" Bow Rider. It came with everything except the fuel key. I'm not close to a marine parts store so need to order one on line. I seem to need a key that measures 21mm between the tips and 34mm to the outside of the tips. What I'm fidning on the internet are mostly 24mm by 34 mm. So my question is am I measuring wrong, and does the 24mm by 34 mm key work with the sea ray ?