http://www.amazon.com/gp/aw/d/B003AV...433192-5607503
I put this seat in my '14 outback. Fits perfect! Several guys have recommended this one on line. You can find different mods that have been done by cutting the legs down to keep center of gravity lower and to fasten it to the yak. All I did was put a towel in the bottom of the yak to keep from scratching it and dropped the chair in. Now, I haven't been fortunate enough to fish on the ocean yet, but for water without too much chop, I don't feel much more unstable than the hobie seat. It also gives you some room for storage underneath the chair. Im about 215 lbs and the chair doesnt seem unstable at all. I was worried that when pushing the pedals the chair may tip back because i dont have it tied down...but it doesnt. Also, I ordered it from walmart.com so if I didn't like it I could return it to the store.
I've got the gts expedition seat for my other yak and this hunting seat is WAY more comfortable. Especially for about $45 compared to almost $200 for the gts.
Good luck!