The contents of a 300 SL tool kit, like so many other M-B items of the era, is sort of a moving target depending on the date of production, what was in stock, who was filling the bag, etc. According to a 1957 service bulletin, one should look for the following:
300 SL TOOLS AND ACCESSORIES
Published November 12, 1957
000 583 33 15 Jack
188 581 00 46 Wheel Nut Wrench 19 mm
183 581 00 60 Wheel Mounting Fork
186 580 01 07 Tool Bag
120 581 06 65 Drain Plug Wrench Size 14
000 581 01 17 Screwdriver, Three-Part
136 580 00 10 Box w/ Spare Fuses
183 580 01 93 Key Case
000 581 00 67 Spark Plug Socket, w/ Handle
198 580 00 65 Spark Plug Holder
000 581 00 56 Spark Plug Holder Retaining Screw
198 581 00 66 Wrench Injection Pump Line, 17 mm
000 581 01 38 Adjustable Pliers
000 585 02 95 Bag For Car Parts
Open End Wrench, 12 mm – DIN 894
Double End Wrench, 6 x 7 mm – DIN 895
Double End Wrench, 9 x 10 mm – DIN 895
Double End Wrench, 11 x 14 mm – DIN 895
Double End Wrench, 14 x 17 mm – DIN 895
Double End Wrench, 17 x 19 mm – DIN 895
Hex Socket Screw Wrench, 5 mm – DIN 911
Hex Socket Screw Wrench, 14 mm – DIN 911
Combination Pliers – DIN 5244
Key Ring – N3976
Instruction Manual
Service Book