Jeep Cherokee Forum - 1988 MJ Dana 44 bearing and seal questions

My 242/AW4/NP231/D44 LSD and have been leaking from Rear axle right side, for a time now.
When removing drive shaft i found inner drive shaft seals in it and nowhere I can find the part number for them.
I have changed the comple rear axle before because it was pouring oil out of it and and i got tired of filling it up once a week. Total about 4 gallons in 2 years time and it started to sound really loud, so I took another one of from on of my spare MJ's.
One week later it start leaking from new one. Took it apart and found pices of the inner shaft seal it the axle tube and now I am looking for new parts, and can't find anything about the seals.
Also on my old axle the outer seal was CR 18731 and inside of it was like a pre load spacer outside of the bearing U399. And nowhere I have found any info about them spacers.
The new National A10 bearing kit did not have any seal with it and I have found a lot of different outer seals and I don't know what to use,
National # 9912, 2689S, or CR18731 all have different width on them so what to use?
When taking apart my old D44 it also had inner axle seals in it, and pulling an drivshaft from an -89 MJ it had it also and Timken U399/U360L bearings.
So if anyone with a know how about D44 axles on MJ's and where to read more about them please answer.