With most of these type of specials the car manufacturers make the parts when the cars are built, including spares. It doesn't work financially to manufacture small numbers of spares, or a one off, as they are needed.
So, most of the special parts will have been made 10 years ago, and then stored, and then as they are needed they are drawn from this stock. Normally you can spot this process when spares are restricted to the vehicle's VIN at the dealer. This prevents the stock getting used for other cars.
Obviously the manufacture has to figure out what spares they need over a certain period but it will mean these spares have a finite life, after a certain time they're all gone.
I'm sure that not all CSL spares will be like this (and I don't know how exactly BMW have controlled the spares) but I also suspect a great deal are, so worth holding onto whatever you have.
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