6248 stacking option

I have finally bought a 6248 for myself to try out at my home. Anyway i want to try out the stacking feature but i have been unable to find the part number for the stacking kit for these switches on the dell.ca site. I can find it on the US site but that doesnt help me much up here in canada. Numerous calls to my rep and the main dell number have gotten me no where. Anyone who has ordered this kit before care to post the part number for it?

 

Thanks