like that one above, all-though I purchased that from the Uk for 15euro there still the same ones from china on ebay that cost that.
generally I would not use most of ebay or ali chinese shit like rearsets etc but for levers I have got them for most of my bikes through the years and I have no complaints as of yet.
the only design difference I think is the end part on the stock or oem levers that is designed to snap off if you drop her and not shear your housing.
I have had asv and pazzoracing levers too for my gixxers too but I think they are way over prized but would prefer over the others all the same , but for under 15e (18uds) incl delivery I think they are well cool, especially these ones short ajustable with the gsxr logo,
and I took a punt on this too, but it was also from the uk and made in china I think but the quality was excellent and she even has a proper diafram expanding rubber thingy same as the the stock ones but she looks nice, the stock rear brake reservoir on the gsxr 1000's look horrible and out of place.
you can get them here from ebay , around 20 I think, excuse the mud and shit on the bike , just back from a spin