Daniel and Eliza Cox

I am researching the families of Daniel and Eliza (nee Fletcher)who were married in Victoria and both died in NZ 1897 and 1899 respectively. I am having trouble locating all of their parents. i.e., William Cox who married Sussanha Barber both from England and probably married in England. Also Eliza's parents: William and Elizabeth (nee Spencer) Fletcher whom I also think probably married in England. Any help would be gratefully received.