Can I replace the contact head
the hose in the contacthead of my vacuum has split, can I replace it
Here is a link to the parts available for a Dyson DC08 (select your particular variant, although the hose is the same for all variants)
Here is the part number for the hose, 905377-01 (if this is the hose that you mean).
If it is what you mean, then if you search online, using just the part number in the search term, you will get a list of suppliers, which may suit you better as to the cost of the part.
Here is an image of what I mean.
(click on image to enlarge for better viewing)
Hopefully this is of some help.