I assumed the OP does not have a lift so I was offering a simple DIY for a quick help.
As you know, most people can't tell where most sounds originate (F/R L/R). On most
client's claims of sound origins, I would Inspect the exact opposite corner first. In a higher
percentage of times, they were wrong thus cutting my time and the $$$ they spent with me! (WIN WIN)
With these cavernous insides of these Edges, put the seats down and boy do they get LOUD! For years, I did
Rattles,Squeaks and Bitches with "Grandma's Grocery List" a mile long! I have ridden all over a car in search of
a client's satisfaction of a noise elimination. From riding in the back seat ( aahhh heating and A/C in the right season),
multiple trunk rides for several miles inside and outside, clinging for life in the hood was the most scary!
But, I never tried holding on with a stethoscope!š¤£