I just opened my SW20000 and it's way cool! Not as big or heavy as I had imagined. And that's a good thing. But, it came with an extra spool, but the spool is labeled SW16000! Of course it's not as big as the 20K that's on the reel, so I know it's not mislabeled. Does an SW 16000 reel exist? If so, I cannot find anything about it regarding size, drag, cost etc. Any help? Thanks!