do I need K12900E-4 for 68 904 rebuild?

the 12006a is short 3 parts compared to the 12008c, the filter, the kick down flex band and the thrust washer kit. So I added the filter (12010C) and the band (B12022AA) to my above list but the washer kit shows as a 1974 or 78 up (depending on where you look). do I even need the trust washer kit?
My total from WIT is $144.02 which seems pretty good.

actually transmissionpartsusa.com has the same stuff for $125 with free shipping, anybody use them?