When you download and install the latest driver from the Dell support site it will create a directory on the system (usually c:\dell\drivers\ where is the name of hte driver file downloaded, e.g., R123456).  In that directory will be the actual driver files including the .inf.  That should be what you are looking for.

I know this but the extracted files is a setup.exe application, that setup.exe contains the drivers for the broadcom chip. So i am still wondering if i could get the drivers somewhere for deployment.

I found this helpful: http://community.landesk.com/support/thread/3478;jsessionid=21C83498256E46642F719A482587FFE7?start=0&tstart=0. Drew Mackay kindly provided extracted driver files on Oct. 10.