Those two rings are for the front clutch drum - looks like you found your problem.
Check the mating bore in the front clutch for damage.
The reaction shaft support looks a little worn below the seal, I would polish that up with 400 paper.
Make sure the new metal sealing ring turns easily within that groove - I would carefully take a fine file and make sure no burrs or edges exist in the groove and follow that with more paper polishing.

Make sure you have the ends locked after installation of the seal in the support.

Not sure what reference material you are using but the built front and rear clutches when placed on the pump can be pressure tested on the bench by using a rubber tipped blow gun and approx. 30 psi.

Just hit each round hole (not the pump attaching holes) around the pump - one is for the front, rear clutch, the others are converter in and out so ignore those.

Using high presssure hides issues liked nipped rubber seals and damaged seal rings.