Tired of my broken seat and it being stuck in the full upright position. I'm about 6 and a half feet and over 300 lbs. This dang seat is murder on my back. Ive looked at several sites for seats but they all say junk like fits a 36 inch waist and thats not helpful. I think im just looking in the wrong places. Anyone know a good authoritative retailer of seats? I'm probably months away from being able to buy one but getting started on finding the seat and budgeting for it already makes my back feel better.