One size does not fit all. I’ve seen a lot of Bimini tops for different kinds of boats that claim to fit 94-102″ wide – same top same frame. That doesn’t seem right to me. When you buy shoes you buy the size you need. You don’t buy a shoe that you may have to squeeze your foot into or so big you may walk right out of them. You buy the size you need. The price is the same if it is an 8 or an 11. Why should your Bimini top for your boat be any different? You can buy the length and width you need and it won’t cost you a penny more. If your boat is 89″ wide and you want a double Bimini top but your front rails are 5″ lower than the back rails then you should be able to order a double Bimini too that is 89″ wide and accommodate a different rail height for no extra charge. With Northstar Products you can. We specialize in it. Custom Bimini tops for a basic price. Unmatched quality. The best part – ALL made in the USA! Try us- you’ll be amazed.