Rear strut bar! (in a sedan)
-remove seat bottom 2 bolts (and 2 possible plastic bolt covers)
-remove seat bottom & set someplace clean
-remove seat back bolts (5?)
-remove seat back by pressing it towards the back of the car & lifting up to free it from it's hooks (It may be easier to have pass through open, it may not. it's up to you)
-set on top of seat bottom, or someplace else clean
-you should now see the strut tops.
-remove 6 bolts
-disassemble strut bar
-place ends into their respective places (maybe cut holes in a thin plastic cover)
-loosely put nuts back on
-assemble strut bar by loosely bolting the middle in.
-torque nuts to top of struts (~14ft/lbs)
-torque strut bar
-put seats back in (reverse of above)
Only pic I can find of my rear strut bar: