It's 615 223 13 04, but these are my 616 arms that I'm using with a 617. The 617 arm probably has a different number cause it needs a place to mount the shock. If it has 617 as the first three numbers, it's probably for a W123 300D. Either will do.

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

1989 Subaru GL Wagon 5-speed Touring Edition