Trouble installing aftermarket speakers on my 99
I bought some Hertz 6.5" speakers from crutchfield rated to fit my 99 4runner to replace the stock. I thought the install would be relatively straightforward. I bought some aftermarket adpater mounts. While the speakers fit nice and flush in the adapters, it looks like i need to fit those back into the original carrier frame. I just don't see how or where to screw the adapter into the OEM frame. It also doesn't appear I can just screw the new adapters into the doorframe either. Anyone got any ideas?