(a) When a manufacturer gives a notification required under 46 U.S.C. 4310,the,bulletin,and.S.C. 4310(c);

(2) The manufacturer's best estimate of the total number of boats or items of associated equipment potentially affected by the defect or failure to comply with a standard or regulation prescribed under 46 U.S.C. 4302; and

(3) If discovered or determined by the manufacturer, a chronology of all principal events upon which the determination is based.

(b) A manufacturer may submit an item required by paragraph (a) of this section that is not available at the time of submission to the Commandant when it becomes available if the manufacturer explains why it was not submitted within the time required and estimates when it will become available.