For removal:
After removing brake band piston cover B2:
1. Remove brake band piston B2 with thrust pin.
2. Remove o-ring.
3. Remove plastic guide ring with lip sealing ring.

To install:
1. Insert plastic guide ring for piston B2.
2. Insert lip sealing ring with the shop-made drive-in drift.
3. The sealing lip must point in the direction of the brake band piston cover.
The rest are described as before.

So I would guess that the sealing ring is functionally similar to the wheel bearing sealing ring. Before you remove it, you may want to note the orientation first.

Would you do a summary report with pics if possible when you are done? Thanks.

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Shane83SD