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In case this is ever helpful to anybody in the future, it turns out it's 5 x 70 x 25. At least I know the diameter and pitch are right, and a length of 25 seems to work.
$0.35 at my local hardware store, $9.95 at the Porsche dealer.
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1986 944 N/A - Recently purchased, towed home, and not yet back on the road.
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