You can buy a block of minicell foam at a variety of sources such as http://www.nrsweb.com/shop/product.asp?pfid=2076.
The foam is easy to cut with a breadknife (or bandsaw). You can sand it or shape with a perforated tool such as a Stanley Surform or Red Devil Dragon Skin, etc. I use double-sided duct tape as a temporary measure to test the pads for fit. If they feel good you can glue them in with contact cement.
With a little practice you will be able to get a custom fit -- cheaper and better than a "kit".
Make sure than any outfitting changes that you do don't affect your ability to exit the kayak.
Full Size Sail Rig
Wall Mount Boat Racks
Touring Kayak Paddles
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