Hi,
I have swapped my CSL 4 speed for a 5 speed. I believe the Getrag 4 speed boxes on CSI and CSL's are identicle. You would need to collect from Cambridgeshire, and the box was beautiful, shifts better than the 5 speed I replaced it with. Let me know if you want it and what you're prepared to pay. I don't really know what there worth, but if there really not alot I'll probably just keep it in case I ever sell and someone want's the original box.
Cheers
Stefano