I don't mean to laugh at the passing of the armadillo, but that's fascinating - I never thought of them as a road crossing hazard.
You can try realoem.com for help with the part diagrams for your car, and minimally - places I've heard people on this site use for OEM parts are: Tischer (google), bmaparts.com,
www.thebmwpartstore.com, and pelican (google "pelican BMW"). Also once you have the p/n's from realoem, you can take those to ebay and type "BMW ###########" with the p/n, you might get some hits of used stuff, dunno how expensive that wheel well part is and what it costs new vs. used. . .I tore up that exact same place, thermometer and all, with a parking embankment many years ago, and then last year again on some weird parking thing (I'm learning to back in when possible!).
Do you guys happen to know what the sensor looking thing is on the drivers side of the car, that would roughly mirror where the thermometer is? I was under there doing an oil change the other day and pretty sure I saw wires connected to a pretty inconspicuous looking sensor (it just looked like a black button), and don't remember hearing what that was and am not able to easily find it in parts diagrams.
Either way - those are all real common items, shouldn't be too bad to find them.
good luck!