carpet kit... a little confused?

Im purchasing a new carpet kit for my 1990 b2200 extended cab. The company offers 2 types. The regular kit and the same kit only it comes with jack box material. I dont know what the jack box is? Is it the little cubby hole behind the driver seat were the jack is located. I dont know which kit to buy. Thanks

Yes, it's the cubby where the jack is stored. If it isn't worn out, or you aren't changing color, it probably isn't worth the added expense(if any).

Funny, there is no carpet in the cubby. It's just the metal floor of the truck. There is carpet on the door that you lift to get to the jack but no carpet on the inside of it.

It's for the door.