transfer case plug on top??? Help

[93jdmlaser]

Im putting my transfer case back in and I noticed a hole on the top. If I turn the transfer case upside down the fluid leaks out. I looked online and it shows a plug looking piece sticking out the top where the hole is. I do not have this piece on mine. The hole does not have threads in it so it must be a plug. Does anyone know what this is?

 

[Defiant]

Breather vent. Try the dealer or a junkyard.