Driver package for Dell Wireless 1510 Wireless-N WLAN Mini-Card

Where can I download driver package version 5.100.235.12 dated 07/01/2011 by Broadcom for the Dell Wireless 1510 Wireless-N WLAN Mini-Card?

I have two Studio 1735's running Win 7 Ultimate. One has the above driver package installed and is working perfectly fine. The other has an older driver that I would like to upgrade but I don't have the original download.

I have searched the Dell download website but I can't find a driver that I can be sure is the one that I am looking for.