The Mets had another player meeting last night, this time with B.J. Ryan, a source told The Post. Ryan, one of the best free-agent closers on the market, met with front-office people from the Mets, according to the source. The group went to dinner in New York. Ryan is the fourth known major free agent the Mets have met face-to-face and the first to do it in New York. The Mets have visited closer Billy Wagner in VirginiaVirginia and catchers Bengie Molina in Arizona and Ramon Hernandez in California. Ryan, a 6-foot-6 southpaw who turns 30 next month, had 36 saves and a 2.43 ERA for the Orioles this past season, striking out 100 in 70 1/3 innings.