B&M called Jack at Muscle Motors about making a big batch. Jack could put together a group buy if there is enough interest. Not too long ago B&M had the parts to make them, they just weren't assembled.
For those that have asked about installation instructions: I will make sure they come with the Ford Racing instruction sheet and any other supporting info I can round up. However there is a very good post from years ago about doing the install already posted here. I encourage anyone buying a shifter to take a look here:
http://www.fordgtforum.com/forums/showthread.php?6203-DIY-Ford-Racing-short-shift-kit-install
As you can see from earlier posts I only secured these about a week ago. I wish I had known I could have gotten these sooner...