Should this link be too long look at www.familysearch.org
and write Johann Klett 1820
Thüringen or Thuringia and you will find a Johann Klett born in 1820 who emigrated in May 1854.
Residence 1854 was a place that I couldn't find in Thüringen/Thuringia, but I assume the place is WEITERODE, now Bebra-Weiterode.
Just a guess.