"I found that they came from Ostergotland Parish in Sweden"
Östergötland is NOT a parish. It is both a county (län) and a province (landskap).http://www.algonet.se/~hogman/swe_counties_map_eng.htmhttp://www.algonet.se/~hogman/swe_provinces_map_eng.htm
Records were kept in the parish. Perhaps you have more information on the location other than "Östergötland".