Welcome!
I don't carry any emergency parts, but in an emergency here is my "survival" list :

small powerful flashlight *
a 12 volt powered light
road flairs*
swiss army knife*
a pillow and comforter
work gloves, disposable rubber gloves*
50' tow rope*
collapsible shovel
a complete change of clothes including under ware*
12' x 12' nylon tarp*
large and small towels*
paper towels*
assorted towels*
toilet paper*
first aid kit*
water proof matches*
water and snacks*
personal protection*
duct tape*
Z-chains
garbage bags*

* are regular supplies, hidden out of sight, others are for winter conditions

Enjoy

__________________
2013 X5 3.5i M Sport
2004 M3 cabriolet SMG