Steering box seals

[RS23VOA]

I've searched this site and the B body site looking for a how to on replacing the seals in a power steering box. I have a 68 box and want to keep it and use it in my car. All I can find are recommendations to get a rebuilt one from Rock Auto or Autozone. Can any point me in the right direction on how to replace these seals? Thanks

 

[mopar head]

a factory service manual will tell you how