Probably not. I've been watching a piece for my front end that hasn't been available for quite awhile, at least since i've owned my 09, suddenly it is. A different front bumper piece I ordered over a year ago and got, is currently not available. Recently it was. Maybe it's possible that if they get enough orders, they make a few. I don't know where they are made, but it would be nice if the molds didn't get trashed.
After doing some investigation I found out those molds are actually at a GM owned parts plant so it's not like they had outsourced those headlights.
I spoke with at least 4 aftermarket headlight manufacturers including one in China... What they said was that there were not enough XLR's sold for them to justify manufacturing the dies and molds required to make those lamps. They would never see a return on their investment without asking a ridicules price for the headlights.
SO... until GM makes some headlights there will be a problem for existing XLR owners.
Other forum users now report the 3rd brake light that runs along the trunk lid is also no longer available BUT is being produced in China as a sub standard aftermarket part.