Leaking rear end 1967 Barracuda

I will be replacing the rear end entirely so I dont want to dump too much effort and money into it. I will clean it up as suggested and just want to get this leak fixed at the moment. What seal should I get ? I looked online and there are multiple options, can someone drop a link? I'll start this once I obtain the parts. I also need to source a gasket for the cover since I want to drain it then just top it off with new fluids.