newly wed couple 1841 / 1842 Leahey

In 1842 young couple William and Mary Leahey nee Morgan,(Labourer and house servant) of County Cork, boadred the Himalaya sailing ship for Port Phillip (later Melbourne), Australia. I think that they were 'bounty passengers'. I'm sure that they were brave. They arrived safely and moved out to the new rural district called the Grampians. They moved back to Melbourne and the records get very tangled there as there is also a William Henry Leahy married to a Mary CatherineMorgan living nearby. This other couple, I beleive were married in Australia. I know some other details of 'the other couple', but, it is my William and Mary Leahey, my Great Great Grandparents that I would dearly love to know more about. If some kind person could help find the marriage record for William Leahey and Mary Morgan in County Cork I would be very greatfull. One last thing, the surname seems to morph from Leahey to Lahy and Leahy.