^pull the 4 metal clips off that hold the lens to the rear housing, pop them in the oven for about 15-20 minutes at around 250 degrees, pull them out and separate with a knife/screw driver/anything flat, and pry the lens off. if the glue hasn't soften enough, pop them back in for another 5-10 minutes and try again
they look good. I'm more of a full-whistler fan myself, but it looks pretty good with just the face painted as well.
they are sold like that without the halo's though: http://cgi.ebay.com/ebaymotors/CHEVY...#ht_1048wt_939