[Mr70]

Have you checked behind the backseat bunting & in between those seat springs?
How bout under the rear deck cardboard?
Behind the 2 door panels,ft. side floor vent panels,& rear seat side window panels?
The headliner,the kick plate behind the brake pedal,under carpet and on top of or under floor sound deadner?
Don't rule out the dashboard.Both inside the pad & on top of the radio too.