My manual just calls it a gasket, but because the rocket scientists at my local repco have 0 training about anything related to cars or 4wds, they can't order me one.
I gave up trying to explain to them where it was located when I kept being told it was part of the 'swivel housing'.
It's on a BJ42 full floater rear axle. Mines made out of rust, but I assume it was once steel, maybe with a rubber seal on the inside edge?
Might be obvious but the arrow just shows where it bolts on the brake drum backing plate.
![Image](http://i995.photobucket.com/albums/af78/narrowscopeofreality/gasket1.jpg)