ships names

i have the dates when my great grandparents came to america. but i would like to what ship they were on. stephen larsen rockne emigrated march-19-1896 his wife and 4 children came over april-21-1899 they were gudve endredatter jerald kari steffensdatter rokne ingebjorg steffensdatter rokne lars steffensen rokne bertha steffensdatter rokne (my grandmother) also is there any way a person could find out if relatives are available in the voss area that one could correspond with. i have received old photo from there and am very curious to know who they are or if any one had info on this family as my grandmother passed on when my father her son was only 7 yrs old .we have hardly any info at all can someone please help? thank you for your time and energy