$60 is far to much for a rear main - they're only ¥1,800
Tom you did really well there! Care to post up the part numbers of the seals you replaced? Its probably worth doing all five if you're going to go to the effort of pulling a gearbox off. Brett's has obviously been off before given the colour of that gasket sealant - you may find the rear main has already been done, and its one of the other seals that's gone like Tom's...
Let you know those part numbers this arvo... have to call my mechanic for that =)