If it is to fit on the end of any old vacuum cleaner then it would have to be either one of the suction-driven heads or one with a recharegable battery. I've seen both sorts on Ebay in the past.
The heads which use a mains or low-voltage mains supply to power it have some sort of connection on the cleaner to allow this to happen and will on the whole have the head supplied with the cleaner (although years ago the heads were often optional extras).
I've never heard of a cleaning head that uses mains power that is avaliable for use on any generic vacuum cleaner and i cant really see how it would work, unless it had a massively long power lead which ran the length of the hose of the cleaner and all along the length of the cleaner lead too? I dont see how though, as the legnths are not standard sizes?
