FWIW
I tried the '998cc' / Streetfighter Store (both UK) option for the high bar .LSL' kit and was quite dissapointed with it.
Then priced the later Sprint ST x genmar risers, went with the 1 1'2" risers, and am very happy.....
your mileage may vary...I have ex bike courier /accidents....don't we all have those though!!, neck /upper back issues, where my C1-C6 vertebrae are knackered< technical, UK term>.......so far, though I haven't done many long distances with the Genmar risers fitted, they work a treat.....pre Genmar, I did a mad 24 Hr/2000 mile 'Sprint' on the RS, without too much trouble...but that was pre my latest( hopefully last) major neck cricking accident.
I know you can get Genmar's in the UK......
http://www.zianet.com/GenMar/body.html
links to UK suppliers.......
I was impressed.......fit is not perfect....IE they do look a bit 'blocky'...I guess if you had access to a nice Milling machine you could really make them mm perfect................. but fittings/hardware/instructions were first class!!!