Not just Shimano Crane RDs. Your Superior came with a Suntour VGT luxe, just like mine. There is a special tabbed washer that fits that indentation, don't lose it!!
You can see the tab on mine in this picture. The washer makes the dropout compatible with any standard rear derailleur:
DSC04779 by
mkeller234, on Flickr
DSC04785 by
mkeller234, on Flickr
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Last edited by mkeller234; 03-11-12 at 09:00 PM.