gmoutdoorsman

These two orange, flat rubber seals and or gaskets appeared in my engine hardware box. If i can remember correctly they randomly fell out of the block when I flipped it over during disassembly. The origin is a 99 5.3 LM7 if that helps. Just concerned if they're something important internally.Don't seem to be missing anything on my short block so idk. Someone help me Identify these!