65 fury 6×9 speaker fitment issues

Hello all, I recently had my original 1965 plymouth fury mopar push button am radio converted to am/fm/aux/Bluetooth. I purchased a new 4x10 dash speaker & 6x9 speakers for the package tray. The 4x10 fits but the holes in the package tray are a bit skinny for modern 6x9's. Has anybody run into this before? Just wondering if there is a particular brand speaker that will fit so I don't have to cut up my car. FYI I also own a 69 dart and the same 6x9's fit it fine. I'm assuming this is strictly...

65 fury 6x9 speaker fitment issues