Try and find a pair of good used rust free trailing arms that have good hub bearings. You might try asking vstech (moderator here). At one time he offered me a pair and said he had a supply.

We never did hook up so I didn't get them. I am still running on the ones I cleaned up and painted. Have to check them out one of these days. Area under the spring and shocks is I believe the weak spot.

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5