OK, I'm going to give this a try and hopefully this helps.
I did a front speaker replacement on my '86 560 and will pass along some of the things I discovered. Most of you probably already have done this or know these things
Those that know the proper technical terms for items I screwed up let me know and I'll edit the post :thumbsup:
Speakers I used FOCAL 100CVX. Here are the critical specs
http://www.focal-america.com/extras/specs/polyglass/100CVX_spec.pdf
Diameter 102mm tight but works
depth from flange to back of magnet 59mm -- more on this later
magnet diameter 72mm
farthest tweet can extend from front of speaker flange 13mm
Tools needed
small Phillips head, 11mm socket, 6" extension (min), and panel tool-see below (my name for this because I don't know the technical one)
Physical capabilities needed
patience, a strong back (for getting under the dash), and a sailors vocabulary (for relieving frustration)
Things not to do
sit on the height adjustment lever, the plastic breaks easily at least it did with my fat ass
try to get to the screws on the drivers side speaker cover by pulling the knee bolster out of the way. You can break the thin connections that keep the carpeted fascia over bolster. See below. fixed by using gobs of clear hot glue.
Knee bolster removed
Closeup of repair
Easy part first -- Passengers side speaker
I took the glove box (GB) liner out to give more room to work and since I was also doing the Stereo install at the same time.
Glove box liner removal (didn't take pictures of this)
put the panel tool under the head of each or the 4 plastic rivets inside the GB and pull down. A small plastic pin comes out. Again using the panel tool pull the remaining plastic socket out that the pin was in.
Pull the light out and disconnect the wires. Now slowly wiggle the liner up and down while pulling it forward and out she comes
unscrew the two small phillips head screws
This is what the little screws screw into, from the drivers side. Notice the small metal lip running across, it will be a pain when the new speakers go in.
pull the cover slightly down then out. The clips should disengage from a bar on the top of the speakers and the cover comes off
Unscrew the old speaker and save the screws for use with the new ones.
I wound up cutting the old speaker wires because they were zip tied to cable bundles and I was afraid I'd cut something important if I tried to get in there and cut the zip ties.
I did a front speaker replacement on my '86 560 and will pass along some of the things I discovered. Most of you probably already have done this or know these things
Speakers I used FOCAL 100CVX. Here are the critical specs
http://www.focal-america.com/extras/specs/polyglass/100CVX_spec.pdf
Diameter 102mm tight but works
depth from flange to back of magnet 59mm -- more on this later
magnet diameter 72mm
farthest tweet can extend from front of speaker flange 13mm
Tools needed
small Phillips head, 11mm socket, 6" extension (min), and panel tool-see below (my name for this because I don't know the technical one)

Physical capabilities needed
patience, a strong back (for getting under the dash), and a sailors vocabulary (for relieving frustration)
Things not to do
sit on the height adjustment lever, the plastic breaks easily at least it did with my fat ass
try to get to the screws on the drivers side speaker cover by pulling the knee bolster out of the way. You can break the thin connections that keep the carpeted fascia over bolster. See below. fixed by using gobs of clear hot glue.
Knee bolster removed

Closeup of repair

Easy part first -- Passengers side speaker
I took the glove box (GB) liner out to give more room to work and since I was also doing the Stereo install at the same time.
Glove box liner removal (didn't take pictures of this)
put the panel tool under the head of each or the 4 plastic rivets inside the GB and pull down. A small plastic pin comes out. Again using the panel tool pull the remaining plastic socket out that the pin was in.
Pull the light out and disconnect the wires. Now slowly wiggle the liner up and down while pulling it forward and out she comes
unscrew the two small phillips head screws

This is what the little screws screw into, from the drivers side. Notice the small metal lip running across, it will be a pain when the new speakers go in.

pull the cover slightly down then out. The clips should disengage from a bar on the top of the speakers and the cover comes off

Unscrew the old speaker and save the screws for use with the new ones.
I wound up cutting the old speaker wires because they were zip tied to cable bundles and I was afraid I'd cut something important if I tried to get in there and cut the zip ties.