Looking at the samtag website,
Mercedes Tools - Mercedes Benz Special Tools & Repair Information-Tool
The 115 589 01 07 00 has the dimensions of
A = 41.50mm B = 35.00mm C= 7.50mm
The 115 589 08 07 00 has the dimensions of
A=42.50mm, B=35.25mm , C=5.50mm
They are both pretty close in size.
.
.