The Mets know that they need to upgrade the bridge to Edwin Diaz before the trade deadline, and that a returning Brooks Raley won’t be able to do it alone.

In the first game of Thursday’s split doubleheader in Baltimore, the Orioles provided the latest reminder that Ryne Stanek is not the guy for the eighth inning during a pennant race or postseason game. Stanek allowed a two-run home run to Gunnar Henderson that undermined a David Peterson gem and decided the game.

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But while the Orioles spoiled an afternoon for the Mets, they are positioned to help with that exact problem. According to league sources, Baltimore is close to being open for business with all available players.

The Orioles traded a reliever on Thursday, but that situation was unique — righthander Bryan Baker went to Tampa Bay for a Competitive Balance round draft selection, the 37th overall pick. Baltimore, sources say, wanted that pick and was therefore motivated to make that particular deal before this weekend’s draft.

Having said that, the O’s are said to be ready or near ready to talk seriously about relievers like Andrew Kittredge — he in particular could appeal to the Mets — as well as righty Seranthony Dominguez and lefty Gregory Soto. Rivals do not believe that Baltimore will trade closer Felix Bautista.

All of these pitchers, along with starter Tomoyuki Sugano and the returning Zach Eflin, would help fill the Yankees’ needs, too. But the Yanks have long been skeptical that Baltimore would ever give them a fair deal; it’s known around these parts as the “Yankee Tax.”

O’s center fielder Cedric Mullins is another rental player who fits the Mets. The team is looking to upgrade that position before the deadline.