Removing the 'spongy - thing' on top of door.
On the earlier cars - and I assume its the same with yours....
Remove door inner panel - held with small nails (usually)
Remove tacks holding cover to 'spongy-thing'.
Fold cover away (toward out-side of door).
Now you get to 'spongy thing.
To remove the cover completely you need to lift off the spongy thing; you will find a metal bar which follows the profile of the top of the door; this is held in place by 4 wood screws into top of door; remove screws to release metal bar that holds cover to spongy thing.
All very easy - no special tools required.
