What shotgun sight is this?

[minnesota1]

I bought a Win super x2 3 gun shotgun from a great guy.  He didn't know what brand front sight was on it.  It's a green fiber optic sight encapsulated in a clear plastic type shell.  It's a little dim now as I think it's a little older.  It's screwed in so I'm trying to find the same one so the two screws will line up etc.  Or are there some type of standardized size for many sights?  The screws are about 2 5/16" apart (center to center) Is there a better option?  It will be used for 3 gun shooting.  Thanks for your help! 

 

 

Edited September 6, 2018 by minnesota1