Trying to remove factory speakers for my park ave but I have no idea how to remove this back panel....

I removed the bottom and top seats already just need to know how to get this off....

I would have thought that you get at those through the trunk. Is that not the case?

Front trim panel uses push in retainers according to manual. I would expect more so hopefully someone has removed it for more info on removal.
Have you tried just pulling it up, or are the side pillars also blocking it?

Rear speakers are only removed under trunk plate and often the Amplifier has to be dropped down to gain access properly to speaker on L side.