Mets’ new manager could be plucked from Red Sox

Only 30 MLB managing jobs exist, making each of them precious, but a Hall of Fame manager sees plenty of reasons the Mets opening is attractive.

“The Mets have been struggling, but you look at what they have and they don’t have and I have to start with the fan base,” Tony La Russa told The Post on Tuesday. “They have a very loyal and passionate fan base, just like that year they went to the World Series [2015] with Terry Collins.

“You look at the other things they have, they have done a great job of developing pitchers and now you have got core young hitters, so I think it’s a combination of the history, the support, and the winning hasn’t been consistent there lately, but that is a great…