as much as i hate to say it take a look at that optimum stuff they sell at wera.
while i had bad luck with fit on my SV with it most of the gsxr and r guys seem to think it fits just fine. it's way cheaper than that HB set you linked and while it's probably not the lightest stuff out there it is resonably flexible and pretty thick - much thinker than HB.
I have HB on the gix and I ain't all that impressed.
I got Rockwell Racing stuff for the 675 and it actually looks pretty good and it's nicer and cheaper than HB as well.
If I were to spend $500+ for HB, I'd step up and get Armour Bodies, it's a hell of a lot nicer.
I was gonna do sharkskinz or catalyst on the 675 but then it's a track bike so who gives two shits so long as it works?
http://forums.13x.com/showthread.php?t=190566 - not 100% they have sets for your bike though.
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