Fender and rearend

[RKS0069]

Hi! I'm hoping I can get some advice

Going through my truck and I was trying not to get into the rearend yet. I was starting to put the brakes back on and realized that the axel seals are leaking. I pulled the hubs and ordered new seals and bearings. I'm now worried that the pinion seal probably needs to be replaced as well. Can I replace the seal without messing up the gear spacing? I'm trying not to take it completely apart seeing how I've never been into a rear end before. Truck is a 1962 GMC 1500 with a Dana 60


Also I'm looking for a right fender. I have a reproduction fender but I'd really rather have a real fender, reproduction is a joke! If anyone has a fender that is in decent shape I'd like to take a look at it. My truck has original mint green paint and It would be awesome to get a fender in the same color, trying to keep as much original patina as possible. Central California area but I'd pay for shipping if needed.

Any help would be great.

Thanks!