Re: evinrude pinion gear
I don't know where you got the number of 337524 from but I suspect it is simply a casting number, it is not a part number (not in any of my parts or price books).
As you've found, it is impossible to find just the pinion, and if you used a pinion from another V6 against your present original forward gear, you would have a mismatch which obviously would lead to problems.
I checked my remaining stock and found that I do have the set (still packed in a heavy protective grease) and I can see why you're hesitant to purchase the set when it's listed at approximately $385.00 or so.
If you can't find the set here on "iboats", and are seriously interested in the set I have, contact me at my email address so as not to take up bandwidth on this site and we'll discuss price..