We seem to get this question a lot, from customers who are sure that we have sent them the wrong CV boot clamp because it "doesn't fit" or is too loose. 100% of the time (so far), the clamp has been correct, but there has been some confusion regarding the proper installation procedure. These clamps are one-time-use only, and require that you use a tool (it can be some needle-nose pliers) to squeeze the "ear" on the clamp so that you tighten it around the boot.
My supplier snagged this picture off of the Internet:
In the future, I will send people to this thread so that they can understand how these work. I suppose I should have put a picture like this in my Boxster book - I'll probably add one to the upcoming 996 book.
-Wayne