Try the easy out, but replacing the support arm shouldn't too difficult. Jack up the engine a few inches and take off the four nuts and pull off the arm and put the new one on. Probably find one at a junkyard. Never tighten with a breaker bar. It's in the name. If a bolt needs to be that tight, you should be using a torque wrench.

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1983 240D 3.0T 4-speed manual, now sold

1989 Subaru GL Wagon 5-speed Touring Edition