Here's the original first aid kit location & contents (not my car; this was from one sold on eBay some time ago). Finding one of these is going to be very hard, but for display's sake, you could fairly easily duplicate one.

I don't know if the /8 series came with the wrench kit & emergency fan belt; I have pictures of those too but can't remember if those were from a W123. The tools were (besides the jack & lug nut wrench for tire changes, which my car still has) a pair of pliers, a Phillips & standard screwdriver (one handle, two sets of reversible shafts), double-ended wrenches: 17/19mm, 17/14mm, 13/11mm and 10/8mm.

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1976 240D "Katja"