The The Eye version is not an instrumental... just a snippet from the track as heard on the Innuendo album...
Unfortunately an instrumental version is not around at all.
To my knowledge there isn't an instrumental of this one floating about. I was a little sad about that actually, to see so many cool instrumentals on The Eye, but this unfortunately wasn't one of them :(.
One could try to devocal the thing - I've had a little success with a thing called DART Karaoke Author. Failing that, see if one of the dudes on the remixing forum would help out.