NEW YORK — NBC’s “Today” is enjoying its widest lead yet, in part from the buzz surrounding its street-level Rockefeller Center studio, where tourists gawk in the early-morning hours for a chance at fleeting stardom. Rival webs hope to fight back by getting even: Network sources confirm that ABC and CBS are in discussions for similar street-level digs for “Good Morning America” and “This Morning” in the revived Times Square area. ABC parent Walt Disney Co. is in advanced negotiations to lease space at 1500 Broadway and 44th Street that would house “GMA” as well as an ESPN-themed restaurant and studio. CBS is reportedly exploring the former Times Square Theater on 42nd Street between Seventh and Eighth avenues. If negotiations prove successful, one or both could relocate from anonymous West Side studios uptown in 1999. Network spokesmen declined comment.