This MIGHT be their marriage record, but dates don't fit:
https://familysearch.org/pal:/MM9.3.1/T ... X:33170596
Are you sure about Giuseppe's birth date? If he was born in 1814 and had a child in 1890, he should have been 76!
Anyway, the record states:
Marriage date: February 22nd, 1873
Giuseppe was 32 and a peasant, born in Castelbuono, son of Santi (peasant) and Rosa Rannò (?), both living in Castelbuono;
Anna was 22, born in Castelbuono, son of Vincenzo and Anna Maria Ranno, both deceased and Rosa Rannò, both living in Castelbuono