Its easier if you completely remove the carbon sleave as most packing material come in the form of a mat.When I have done it in the past,I simply wrapped the material tightly around the perforated tube then slid the carbon sleave over.It was such a tight fit that wiring was'nt required.
I think the packing kits have been deleted from the Performance catalogue,but you should be able to get everything you need from A16 Road and Race.
http://www.aa16.co.uk/