http://www.brownells.com/shotgun-parts/sights/front-sights/shotgun-night-sights-prod6847.aspx
If I copied the link correctly, the Meprolight front sight 34301 (part of a pair, unfortunately) looks amazingly like the 1301T Beretta front sight - and it is a replacement for a Benelli kissing cousin! I'm waiting for a return email from Meprolight to see if it is, in fact, interchangeable. The rear does not appear compatible.
Will post again once I hear from them.
OldJohn