This took me and my fiancé about 30-45 minutes.
Materials Needed:
1. 6 1/2" speakers
2. box cutter
3. terminal ends
4. speaker wire
5. Dremel or cutoff wheel
6. Vice
7. Phillips head screwdriver
8. Drill w/ phillips bit
9. screws to secure speaker
10. Green wires w/ connector still attached from stock speaker
11. Blue wire connectors (not sure what they are called)
DIY:
1. Remove rear speakers and bracket
2. Remove stock 4" speakers
3. Cut about 1" out of the long plastic piece with the box cutter. Make sure not to cut too high up so that the piece breaks off.
4. Cut the connector piece off the other side to provide enough clearance for the speaker.
5. Break the bracket off the old speakers
6. Use the cutoff wheel or Dremel to make the piece you broke off flat.
7. Reinstall modified broken piece and twist the speakers so you can screw them in as the pic shows.
8. Attach the speaker wire and terminal ends to the stock wires.
9. Reinstall the speakers
10. Sit back and enjoy a better sound from the trunkless wonder.