Did you locate DUSEK's and VLNA's arrival manifest?
How about their church marriage record or state marriage application? By any chance both of them were naturalized citizen or had social security numbers?
VLNAs in CZ's phone book:http://seznam.1188.cz/s?q=vlna
There is more than 1 Vranov in Czech Republic. http://mesta.obce.czhttp://www.jewishgen.org/communities/loctown.asp