More 7-1/4 axle questions

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On my last post, many of you gave me a hard time for even staying with the 7-1/4 axle, but the car is just a daily driver so I'm okay with it. The car came with on enlarged stud hole and the stud was missing. I had the first mechanic try to replace the existing studs with RH studs, and then another hole got screwed up.

So my best bet was to get a used axle with RH studs installed and just replace the axle and bearing. Well I got the axle from a junkyard, but as you can see, I've some retainer issues.

So now it looks like both existing and junkyard bearings need to be removed in order to salvage the existing retainer. From the manual, it also looks like the collar needs be heavily notched to get it off.

So then, are new gaskets, a seal, and new collar recommended to reinstall? Are these parts available? How does the bearing get lubricated?

Am I looking at this correctly? Things always seem to get messy.