One brake handle pulls two cables, like this:
Dual Pull Brake Lever "Pulls 2 Cables" NEW NR 13748 - eBay (item 380187319952 end time Jan-10-10 11:16:02 PST)
I bought that very handle from that very seller, cheapest I could find. They're all pretty much the same. Put that on the right side, so your right hand does throttle and brakes, and your left does clutch.