Functionally impossible, and not worth the time, to rebuild those stock shocks. I ground off the lip of the damper and discovered that the factory seal is ultra thick underneath it -- at least 10mm and it's incredibly hard to pull back out of the body due to the abundance of friction. I would have to fabricate or purchase a specialized puller to yank the shaft and seal out together or reach down through the lips of the seal and pull it up and out.
And then, if I successfully got it open and replaced the seals, I'd have to fabricate a new cap for the shock body. I had a feeling I might be able to do this on my lathe, but after grinding down the crimped edge I found that the shock's wall thickness is slim and the steel is soft. A press-fit cap would not be very secure and threading the inside of the body is impossible on my little lathe.
The best you could do is find a spot to drill a small hole in the bottom of the shocks, drain out the old oil, fill them back up with new oil, and reseal the hole. If your seals are leaking then you're outta luck.
Buy something better that's meant to be rebuilt. None of the quality options are cheap but good suspension never is.