The Hammers won a first piece of silverware since 1980's FA Cup, and a first European trophy since 1965, on a historic and emotional Wednesday night in the Czech Republic.
Said Benrahma had opened the scoring for West Ham with a 62nd-minute penalty in Prague's Eden Arena after Fiorentina captain Cristiano Biraghi was ruled to have handled the ball upon review.
The Italian club were level five minutes later from Giacomo Bonaventura but West Ham had the last laugh in the 90th minute when Bowen took up a defence-splitting pass from Lucas Paqueta and beat goalkeeper Pietro Terraciano.
Yes, it may be only Europe's third-tier competition, the one treated as an unwanted distraction by Tottenham, among others, in its inaugural form last season.
But this is West Ham. The West Ham who routinely see relegation as an occupational hazard. The West Ham who made a song and dance of leaving their old stadium and an almighty hash of moving into the new one. The West Ham who had to go begging to their former manager to save them from the drop, 18 months after they got rid of him when he had done just that.
Just nine weeks ago that same manager watched as the away fans unfurled a 'Moyes Out' banner during a scratchy 1-0 win over Fulham, which likely saved his job.
Now David Moyes has written his name in West Ham folklore, joining Ron Greenwood and John Lyall as trophy-winning Hammers managers. A place in next season's Europa League means the club has qualified for Europe three seasons in a row, for the first time.
And what a way to sign off for Declan Rice, destined to leave this summer but with the legacy of becoming only the third captain, along with Bobby Moore and Billy Bonds, to lift silverware in the club's 128-year history.
The Hammers have given their fans, 5000 of whom were - officially at least - in attendance and the 20,000-or so who just wanted to be in Prague for their first European final in 47 years, the ride of their lives.
With DPA.
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