This is a genuine OEM part, not a pattern / aftermarket item. It will fit:
20HP carb: 1985 - 2006
25HP carb: 1985 - 2006
30HP carb: 1985 - 2006
25HP E-TEC: 2009 to current
30HP E-TEC: 2009 to current
If you have any doubts as to whether this will fit your outboard, please email the model and serial number, and I will be able to inform you of the correct one.