Replaced bearings on Samsung, not sure where washer goes

HI

Samsung eco bubble 7kg, disassembled machine, when I took the drum assembly out from the outer rear drum/bearings, there was an o-ring (or possibly flat rubber) washer, half inside the seal and half inside the bearing.

Judging by the shape of it, it has obviously been trapped and squashed out of shape as it should be round (well nothing that shape for it to fit on) . Not sure whether it's a flat washer or an o-ring.

I'm going to get a new seal even though I removed the existing one by hitting the bearing from the other side (hence its probably ok) but as I'm replacing the bearings and spider arm, makes sense to do the seal too.

I just cant work out where the o ring fits into this, it's the correct diameter to fit on the spider shaft, does it go underneath the seal, is it part of the seal, should it be on top of the seal?

Model no is: WF70FSE2W4W/EU

Many thanks

Attached pic of seal/bearings in back outer drum where washer came from, and pic of both sides and thickness of washer