Guard column & cartridge for Agilent ZORBAX Extend-C18 Column

Hi All, 


I would like to purchase a guard column kit and related cartridges for the Agilent ZORBAX Extend-C18 Column (P.N. 763953-902). I was lost through navigating on the Agilent website and could not figure which is the right one to purchase. Any information would help.


Thank you in advance,


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