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I need to select a push button having (2NO + 2NC) contacts, So what is the part number ?

You can use the below combination :
ZBE203 : 2NO Contact 
ZBE204 : 2NC Contacts
ZB4BZ009 : Fixing Collar
ZB4BA3 : Head 

So the push button combination will be : ZB4BA3 + ZB4BZ009 + ZBE204 + ZBE203 

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