The 4 LJ50 crank seals are:
09289-44003 front
12311-67010 retainer x2
12322-63210 inner race x2
09283-35006 rear
I see from
THIS LISTING that the LJ20 uses the same front seal.
It's nice of the seller to have also listed the NOK part number for the seal AW6865E. See the seller's other items, he also has a LJ20 little end bearing which is the same number as a LJ50 part, but my feeling is that the price he's listed them at plus postage might be more expensive than sourcing them locally.
If you can read the seal numbers of the others off the crank, Weaves might be able to source them? (Big wish??)