[Biomecha]

They usually have options with larger sizes. At least here, if the floor model doesn't fit, they usually have a bunch of catalogs with all the available sizes and colors for the different brands they carry that you can order from. They salesperson would help you figure out the size, and you might even find more color options and shapes. But online, they should also have a way to figure out sizing. Maybe it depends on the site? I haven't tried that method before.