General Motors Corp. said on Jan. 14 it is expanding the availability of satellite radio beyond the 2002 Cadillac Seville and Deville. According to GM, XM Satellite Radio, which is available as a factory-installed option in those two cars, will be offered this fall on nearly two dozen 2003 models: Buick Rendezvous and LeSabre; Cadillac Escalade, Escalade EXT, Deville and Seville; Chevrolet Avalanche, Cavalier, Impala, Monte Carlo, Silverado, Suburban and Tahoe; GMC Denali, Denali XL, Sierra, Yukon, and Yukon XL; Oldsmobile Alero; Pontiac Aztek, Bonneville, Grand Am and Sunfire.