Product review (5 stars): Genuine GE icemaker install kit
It was a little more expensive than I would have expected, but it works as advertised.  I bought this ice maker to replace an old one that leaked, slowly turning my freezer into a great big block of ice.  This one does not seem to have that problem.  The kit comes with everything you might need to install the ice maker on a fridge without one.  It includes the water valve, all the tubing, brackets, mounting screws, etc.  The instructions recommend replacing the water valve if you are replacing an old ice maker to ensure compatibility.  This made the job take a bit longer than the anticipated five minutes, but I was still finished in under an hour.