two things on the flex disc issue:
when my 95 e300d needed a new flex disc, the
OEM part came with new bolts and nuts, so MB
answered the replace-don't replace questiion
since this is a new car in your stable, it might pay you to have a good tech put it up
on the lift. this way you can check out the under side for any items that need service
I've found a great shop that did it for around 50 bucks.