Van's too.
People are plugging other suppliers, which is fine. But there is also nothing wrong with Van's belts for the -7. Note that if you buy a non-Van's belt, the different suppliers do not use the same size bolts for the installation, so find out from others what you need to order or modify.
Van's has the typical auto-style buckling latch. Others with have the two military or racing style variants for the latch. The Van's buckle style is very easy to use and light weight. They lack fancy stitching or padding, but they are comfortable, and you'll probably save a few bucks.
The color belts would typically be something you'll want to match with your interior finishing options, so they don't come with the kit.