Front 4x4 axle is leaking right at center joint. Does anyone know a part number for the gasket ? Would greatly appreciate it.

Gasket in between

 

I wouldn't use a gasket.
Not even sure there is one there.
I'd have a good look at the Factory service manual before I took it apart.
I'd degrease the surfaces thoroughly with acetone or similar and use Toyota red FIPG or Permatex Ultra-Grey to reseal the clamshell

 

thank you

 

nice info.