All depends what mods you are after. I am the DRZ mod bitch so ask away. Unfortunately you may have to go globe hunting; bits on my bike have come from Israel, U.S, Germany and AU!
Oh this is just too easy. Do the same as everybody else and take them off your bike and put them in a box in your garage, in theory they can't get broken there. Then when you sell the bike give them to the new owner and let him worry about how they fit.
Or I suppose you could get some minature ones with flexible stems if you don't know how to do hand signals.