thought I would share this. I hav a 1987 subaru, dual rnage. My neck of the woods breaks these like candy in the darndest places...just staying road worthy.
I found two beams that really needed to be there. I made some..
if you can decipher above, it gently meets the center carrier in the tunnel, and the square end is where the rear seat bolts go through...
the other end is this:
and here is another angle:
this has proven to fix every other error I welded. I am in 12 full mig reels, 2 pounds a pice.. and greater than 32 sq feet of sheet, and 4 spring steel rods.
I could have save alot of effort with these beams installed...your creaking sube is telling you something.
one final shot: