The Bye- Bye Buggy Fat Tire Kit is available for both 4 and 6-ft seat models, offering you a great deal of versatility for your product. Any of the original buggies that have been purchased after 2000 can easily be converted to a fat tire buggy. The kit includes two front wheel caster assemblies and all mounting hardware to add two fat tire front tires. It also includes an installed brake, one rear axle assembly, mounting hardware and two fat tires for the rear. The easy to follow instructions make converting your Bye-Bye Buggy a breeze. If you have a fleet of buggies, you could always leave some the way they come traditionally and convert others so users have the choice, to accommodate their personal preference.