hello mate .. all the bikes 748/9** have the same slave cylinder so your only option is a replacement after market one ...
I have the STM one as it was a deal, well, when I say a deal I mean I robbed it from Nelly as it was his last one ....
If i was looking to get one now I'd get the Cornerspeed one ... just call Nelly and he'll sort you out .. my mate had one put on his 748R as he uses it loads in London and he says its a huge improvement over standard ...
http://www.cornerspeed.co.uk/pages/access.html