555118, 555121, and 398970 have all been superseded to 692279 which is the foam washer.
270167 is still a valid part number, but if ordered today, it will most likely contain the foam washer and not the felt.
About 10 years ago, Lee Elliott from Lee's Kart Supply in Terre Haute, IN sourced the original size rubber lipped seal.
In the spring of 2015 there were quite a few 10 packs of them hanging on the pegboard at Laukaitis Racing in Decatur, Illinois.
You can try calling Matthew at 217-877-8877 and see if he has any left.