Remove the tail light assembly? Easy question

I am trying to pull off the tail light assembly on my 93 corolla to swap out the brake bulbs. I pulled out the 2 screws and the one nut, but there are 2 black fastener-looking things on the side that I cant figure out how to pull out. The owners manual doesn?t show them, and a repair manual doesn?t discuss them either. I?d hate to have to bring it to a mechanic for something so minor. He might try and sell me blinker fluid if I do. Thx