3rd Gen 4Runner 6.5" Rear Speaker Plate

thingiverse

This is a plate that is designed for the rear speakers of the 3rd Gen 4Runner. These were specifically designed for the JVC CS-J620 Speakers but most 6.5 inch car speakers should work. The only extra part you will need is a slightly longer screw that goes through the speaker and plate before attaching to the door panel itself (I don't know the name of the screw). As for the connector that you have to take off of the original plate, you should be able to mount that anywhere that isn't metal/touching metal (I used carpet tape and mounted it to the plastic sheet that covers the whole door). If you do go with the same speakers that I did and care about your sound, I would highly recommend adding a subwoofer of some kind - those speakers have great treble but no bass at all.