If that is the bolt in your hand, you won't be able to find an exact match at a hardware store. I have bought millions of bolts at hardware stores and have never seen a flanged bolt. You would need to use a washer under the bolt.
2016 Rebel, 2013 Royal Enfield B5, 2009 Genuine Stella, 2006 H-D Sportster 1200, 2006 Vespa GT200, 2001 Yamaha XT225
"I refuse to believe in a risk free society where the thrill of living is traded for the safety of existence." — Nick Ienatsch