Kernel NW740 for SAP Web Dispatcher

Hello,

where and how can I find the correct kernel "NW740" for my SAP Web Dispatcher installation?

I proceeded like this:

Software Provisioning Manager -> SAPinst -> SAP Netweaver 7.4 -> MS SQL Server -> SAP Systems -> Standalone Engines -> Web Dispatcher.

Now during step 2 "defining parameters" I need to provide a software package calles "Kernel NW740". My server is a MS server 2008 x64.