1) How many secrews are there to the tail light assembly on a and 06 matrix?
2) While changing oil the oil pan plug became stripped on the outside when using a metric socket?

Clean the hexes up with a file, if necessary, and use a 6-point box-end wrench.

Or use a vise grip and get a new drain plug . 3 10 mm nuts. Sometimes the gasket really sticks and you will have to pry a bit.