The Rockies have improved their bullpen for 2011 by acquiring right-hander Matt Lindstrom from the Astros on Thursday for two Minor League pitchers -- left-hander Wes Musick, a former University of Houston standout, and right-hander Jonnathan Aristil. Lindstrom, who turns 31 on Feb. 11, went 2-5 with a 4.39 ERA for the Astros last season.