i have had a boat for 2 years and still really new to boating.My engine is a 1990 merccruiser alpha 1 4.3l.The starter is shot but i can only find one of the bolts on the top.I,ve searches up and down for the other and found no empty holes so i must be missing it or its in a place i cant feel.Also is it safe to replace the starter with and auto starter.Ikeep getting different views on that.