How do I determine if this subwoofer
https://www.woofersetc.com/p-4571-ef...subwoofer.aspx
fits in the mopar sub box?
It fits in depth
The aftermarket one says it has a mounting hole of 7 inches.
The sub measures 8 inches across, but the holes are not 1/2 inset on each side.
PT Cruiser Subwoofer Mopar 80 watt digital amplifier | eBay
Kind of hard to tell from the picture, clicking on it helps, but the holes are not far from end.