Mikuni genuine part x 4 jets , Will fit other bikes that use this type of pilot jet    

Part number 4G0 14142 30   , size #30

Excellent unmolested used condition with good threads and driver slots , may have dirt so a good clean or blow through with airline recommended    

Please be sure from the photo and information given that this is the part you require 

Feel free to message me for any more information

SL FZ600 Carb box