Here is how the first aid box and its pocket/cover topic looks like from parts list perspective:
113042 - no mention
113043 - it is there for W113 under Panelling
We have two parts numbers for pocket
A 111 680 55 58, SA 55739 where you could pick leather on leather imitation trim and
A 113 680 00 58, SA 55739 - with pocket and imitation leather trim (so we have something for W113)
Then for the first aid box
A 000 865 00 50 replaced by A 000 865 08 50, active part numbers, under SA code only (55739) and it may come, depending on SA number extension from "With pocket less trim" through all kinds of trim, leather and leather imitation and two kinds of pockets.
It is further replaced by A 000 860 02 50, same SA but with option added to possible configurations "with bracket less trim". It is still available today, no idea what you get.
113044as in 043 we have two parts numbers
A 111 680 55 58, SA 55739 where you could pick leather on leather imitation trim and
A 113 680 00 58, SA 55739 - with pocket and imitation leather trim (so we have something for W113)
and then further for the pocket, active, NLA
A 115 865 02 55, cover, SA 55739 with a lot more options, including panels with stereo, RHD, LHD, trunk, A/C, etc. - apparently for more car models. There are two lists of SA code extensions.
For the first aid box we have A 000 865 00 50 replaced by A 000 865 08 50 replaced by soft sided A 000 860 02 50 each with two sets of SA 55739 extensions.
I would conclude:
1. There was a set dedicated to W113 in 113 043 times.
2. Then it was merged with sets for many other cars. If we went into r107 I am sure we would find these parts. Multiple types of first aid boxes, multiple brackets.
3. Very difficult to say what type of box might have been used late for 280SL.
As for the pictures: below are links to threads with them. One is provided by Hans and one is a link to thread where 49er is referring to special equipment catalogue from ca 1966. I also agree with Kevinc's view there that black/green box may be fine for early 70ies.
https://www.sl113.org/forums/index.php?topic=15568.msg106882#msg106882 https://www.sl113.org/forums/index.php?topic=14898.msg101955#msg101955