The Mets want Bobby Parnell to be the closer moving forward — and why not? He is a homegrown success story: the guy they saw talent in, stuck with and watched develop into an elite closer.

Ignore his save total (15), which reflects the Mets’ low win total. Parnell has the same WHIP (0.88) as NL saves leader Jason Grilli and essentially the same ERA (2.48) as Edward Mujica (2.41), who is third in saves, and no NL closer had a lower OPS against than Parnell’s .499.

The Mets are assembling a young rotation led by Matt Harvey and, they hope, Zack Wheeler with, they believe, more to come. The idea of having an established closer to protect that group makes sense. But so does this — seizing opportunity.

The Mets have to be open-minded about trading Parnell this month because two factors exist that could increase his value and, thus, increase the likelihood of finding a young, impact, cost-controlled bat to blend with those young arms:

1. There are several teams, notably the Tigers and Red Sox, in full go-for-it mode that are desperate for late-inning solutions.

2. There is not a lot of inventory. There is no certainty, for example, the Phillies will trade Jonathan Papelbon. But even if they do, his velocity has dropped and he is owed $13 million in both 2014 and ’15. Parnell is making $1.7 million this year and would earn about $10 million in total between 2014-15, after which he would become a free agent.

The Mets have their doubts if even teams in ninth-inning panic will surrender significant pieces for a closer. After all, it was not until well into the second half that the 2011 Cardinals settled on Jason Motte to close and the 2012 Giants picked Sergio Romo — and those are the past two champions. Even this year, the Pirates’ Grilli and the Cardinals’ Mujica show that closers — more than any other position on the field — can materialize.