Here are the Windstorm center case descriptions and part numbers:
WS9827/WS9927/WS9827-F/WS9927-F CENTER CASE LESS COVER RHR 101024
WS9827/WS9927/WS9827-F/WS9927-F CENTER CASE LESS COVER LHR 101023
WS9857/WS9957/WS9857-F/WS9957-F CENTER CASE LESS COVER RHR 24086894
WS9857/WS9957/WS9857-F/WS9957-F CENTER CASE LESS COVER LHR 24086860
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