Sierra Marine 18-2638 (Mercury/Force FK1065) Gearcase Seal Kit is listed as fitting 1997 and earlier 9.9 & 15hp Chrysler/Force motors. I can’t vouch for the reliability of the information. http://www.marineengine.com/newparts/part_details.php?pnum=MERFK1065
EDIT: Also see http://laingsoutboards.com/chryslerforceparts.html
