BOSCH O2 sensors, see images for P/Ns. Fronts are direct replacement and the rears are the splice in version.
$300 shipped in CONUS, If you’re interested in the DPs I have listed and these then I will make you a package deal.
http://i1294.photobucket.com/albums/b601/rs4elitist/For%20sale/IMG_1328_zpsc3ynb5wf.jpg
http://i1294.photobucket.com/albums/b601/rs4elitist/For%20sale/IMG_1329_zpsch3bmf4s.jpg
http://i1294.photobucket.com/albums/b601/rs4elitist/For%20sale/IMG_1330_zpsos4uq7rk.jpg
http://i1294.photobucket.com/albums/b601/rs4elitist/For%20sale/IMG_1331_zpsucfybwbx.jpg
http://i1294.photobucket.com/albums/b601/rs4elitist/For%20sale/IMG_1332_zpspolzednf.jpg