I've ridden drops for 20 years but (after commuting with a flat bar hybrid) have come to prefer the wider hand position of flat bars. I'm going to convert my road bike over and I'm looking at the shifters that Shimano designed for this ("sl-R440/R441) They list these as "2/3" referring to either a double or triple. I take that to mean they can be used for either. I don't know how that would work. I want to use them for a double, has anyone installed a set of these shifters and can explain the installation? Is there an ajustment for one or the other?

I also have another question. Will any brake levers designed for flat bars work with the existing 10 year old Ultegra calliper brakes I now have or do I need to look for a specific model?

Thanks,
Bob