Dell E7450 network drivers - what exactly do I need?

I'm trying to do a clean, bloat-free install of Windows 7 on the Latitude E7450 and I'm confused about the network drivers available for it (the other drivers are confusing too, but let's focus on the network).

What WiFi driver should I install? What's the difference between "Intel 7265/7260/3160 WiFi Driver" and "Dell Wireless 1707 WiFi/Bluetooth Driver"? Why is a WiFi/BT driver three hundred megabytes?!

What exactly is the "Intel 7265/3165 Bluetooth Application"? Will it provide a Bluetooth driver?

My laptop does have the Intel 7265 chip (I think... the driver for it has enabled WiFi), so why isn't there an "Intel 7265/.../ WiFi/BT driver"? After I've installed the 7265 driver, my Bluetooth headset is recognized, but won't appear as a sound output device.

There's also a "Dell Wireless 1560 WiFi/BT Driver" listed under my service tag.

I don't get it - doesn't DELL know exactly what hardware my laptop has, based on the service tag? Why am I presented with all these confusing driver options?

 

Anyone?

In the meantime I've tried installing the Dell Wireless 1707 driver, and it complained the hardware was not present (duh).

The Bluetooth application - Network_Application_RYCJ4_WN32_17.1.1411.504_A03 installed some BT drivers, but there are still three Bluetooth devices in Device Manager with problems and the music service doesn't work with my LG HBS730 Bluetooth headset.