Yes..Torx sizes are torx sizes. 30,35,40 and so on. no metric. Sears has them, You may have confused the sales clerk when you asked for metric.
Unless...I've never done the rear shocks. you need metric Allen wrenches or have what looks like a very fine toothed torx (not called trox at all) that is a europein tool like commonly used on VW CV boots. Got Mine at the local Napa auto store.
Hope that helps thouth it likely doesn't.
Good Luck anyhow.

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83 300SD
3 fords