Differential cover gasket?

I need to replace the axel bearings and seals on the 8.25 rear on my 70 Duster. I understand that the axles are held in with C clips so I have to remove the diffential cover to get the C clips off and the axel's out. I'm having a hard time sourcing replacement gaskets to get the job done.
Also the part numbers for the axle bearing and seal would be helpful too.
Thanks