Here's the M/C I've been recommending, and using for the last few years,, it 's 15/16 bore, for less pedal effort, and better feel..
It NEEDS NO ADAPTOR,, looks stock...
$50.00
http://www.ebay.com/itm/Brake-Maste...3ceed30135&clk_rvr_id=929799270667&rmvSB=true