A few guys on red monkey tried to copy some off of a race bike but ultimately had difficulty fitting them. The intake restrictors are designed to work with certain race fairings so unless your putting them on a bike that uses the fairings they're designed for you might not be able to fit them anyways.
I have a set from OPP (bought them in 96) but they will no longer produce them. I have searched for them as well as intake tubes for my 7R and not much available for a reasonable price.
Sixstring recommended Squid Skins and I have a set of tubes coming. Can't wait.
Hey Ninjanut definately let me know how the squid skinz stuff works - if they're half decent i'll drop the f-hot crap i have for a set in a second! They still haven't gotten back to me about the massive leaks in the ones I bought.