OK.. I think your 'two notches' refer to indentations or 'notches' along the seam of the snorkel? I have a second original air cleaner (fllat borttom) so I checked that unit tonight. The seam is along the front side of the snorkel(towards the front of the car), and about halfway along the seam is a little 'notch' in the seam (only one notch)... The snorkel is right at 11" long (from the back curved edges to the tip), has an inlet of 1.5" ID, and the curved outer lip of 2-3/8" in Dia.. At the point where it connects to the base, it is an oval slightly more than 4" in width, and close to 2" in height.