Well that sucks! I’ve got one that I can only hand tighten, it was stripped after my first visit to the dealer.
Since you need to be careful with these anyway, I personally would try helicoils first, or maybe these knock-offs...
Amazon.com: Highking Tool Thread Repair Kit, M6 x 1.0mm Thread Repair Insert Kit Compatible Hand Tool Set for Auto Repairing (M6-1.0): Automotive
In case you need new bolts part numbers...
SKID PLATE BOLT 9008011373
LOWER COVER BOLT 9010906330