Replacing a pinion seal on 8 1/4

Anything special to do when replacing a leaky seal on a 8 1/4 rear end? Does the new seal need any kind of sealer put on (outer edge) before driving it in place? Can I tap it or do I need to use a special tool to drive it evenly?

Also who sells new pinion nuts? Mine looks to be in sad shape.

Thanks.

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