The notched piece under the Handley Page grille is from the AMT 1:25 International Payhauler.
Flintlock,
I have the PayHauler but can't find the piece you're referencing that sits underneath the Handley Page grille. Do you have a part number or a photo of the sprue? I'm somehow not seeing/finding it. Was it a modified piece from the Payhauler, or an as-is piece?
Thanks,
SK