Got smacked by something on the highway today; only damage was a broken fog lamp lens. Has anyone ever replaced one of these ? If so, how hard was it to do ?

 

Mines was replaced for the same thing. The dealer here stated it was not covered under the warranty unless it was loose and that was the cause of the crack, so they replaced both for about $135.

 

It's a complete new unit - not just the glass.
Now... the fog lamps have been revised from the original ones which came out on the 2004 models. I have a 2005 and it came with the original fog lamps - I think the chrome cover for the bulb kept falling off so they did a redesign at some point.
Do a search, somebody posted pics of the old and new fog lamps - if you don't know which ones you have, you would be wise to find this thread.
The new lamps look a lot different to the old ones - so you may have to buy both LH & RH.
Mine were replaced under an insurance claim about 12 months ago - about $85 each.
Hope this helps.