If you want everything you may need to replace you need the full overhaul kit FUA35001S for each carb plus two float needles FUA35318 plus a can of carb cleaner. If you are buying all this you should buy two new float assemblies FUA54766 as well.
Its not the total mileage of the bike thats important, its the time since the last complete carb overhaul. If its been a signifant time since the carbs were last done you will either need a source of compressed air, or a can of air from Maplin. Getting some of the air passages clear can be really difficult and you may need to send the whole carb off to be ultrasonically cleaned.