Advice I receive from John(UK) on shims and gaskets on rear axles was as follows:
"The correct order for gaskets and shims is:- starting at the axle:- shims/gasket/brake back plate/gasket/Hub.
Don't use gasket cement of any kind as the axle never fully tightens and moves slightly, this will wear away the cement over a period of time. Same applies to the gasket if you don't check it frequently, but it is much better and lasts longer than cement."
That is: there are 2 gaskets, one each side of the brake back plate. Shims next to the axle housing. No gasket cement. Axle studs need to be tightened every so often.