Unfortunatly the tank is spoken for...(trading it for an America tank)
The tab is a two hole (side by side not front to back)
go to
www.bikebandit.com and look up the gas tank (in the OEM parts section) for a Bonneville/Scrambler/Truxton (they're all the same) the schematic of parts has a good illistration of the tank and the tab...
As far as fit don't know...