inspection covers?

*two open holes.
I had changed the oil back in Oct and dont remember seeing these open, but they may have well been. I am pretty sure there are supposed to be plates on em.
The car is still up on jackstands until I find a few answers.
a. what are they called (if i referenced part suppliers)
b. where can I get them?
c. any danger of having them missing?
If i cant find anything, I am thinking about cutting up an aluminum can to make my own and use RTV to keep them in place.
But unless you spend alot of time on gravel roads or muddy roads (mud boging) I really would not be concerned with them










