I bought the size 4 for a NookColor (which I use in portrait mode in its case). I believe the base and cover are an option for people who want multiple covers. I bought a regular cushion, but added (optional) embroidery.
You can e-mail the owner at the address on her site; she's very helpful about what size to order, etc. and gets back to you right away. It took less than a week from the time I started asking her questions to receiving my finished product.
Originally Posted by Blossom
I took a look at the site but got confused on which one would hold a Kindle Fire in Portrait mode? Also there was talk about base and covers... do you have to buy both? That's really pricey.