Potmesil, Josef Lindsay, Neb. 32 1889 1921
Josef was in US in 1901 and July 1921; going to father Vaclav POTMESIL, Box 91, Lindsay, Nebr.; left an uncle Josef POTMESIL Klipec p. Velim

http://www.mapy.cz/#x=15.144966&y=50.080291&z=13&...
http://www.mapy.cz/#x=15.144966&y=50.080291&z=13&...

the 1930 census, did it have notation Na-naturalized; Al-alien or Pa-first paper for the children that you are looking for their arrival manifest?

wrong manifest comes up for Alois POTMESIL
Potmesil, Alois 36 1875 1911
AND
Potmesil, Fanny 23 1888 1911 Maybe you have located the corresponding one.

Did your grandfather Alois come with the group that you are looking for their manifest?