Originally Posted by Grubnut

Agreed, but the likelihood of damaging the thread removing a snapped bolt far outweighs that of damage caused by a galvanic reaction as this depends other factors such as the ratio of the surfaces; you should try to have a large anodic area (aluminum) and a small cathodic area (stainless steel). Furthermore it would also require the presence of an electrolyte such as salt water.....not impossible on our winter roads. However you have me doubting myself now so I will now have to do some more research and check my wisdom on this !!!

Replacement alloy bolts were a mystery to my local Chrysler dealer and Mercedes can't work out anything without a Reg number and the shutters came down at the mention of Chrysler!

Finger tightness in this case for me would be nipping the bolt up using the short angle on the allen key

The specified torque settings in the official Chrysler workshop manuals appears to be a misprint and massively wrong.