Martin and Mary O'Grady

I am looking for any record of Martin O'Grady and his wife Mary Casey who lived in Tipperary/Limerick in the 1800s. Their sons John (b. 1814) and Patrick worked in Limerick as Blacksmiths before emigrating to Australia and the US respectively. They could be from both counties as on John's passenger list he listed as being from Tipperary but working in Limerick. I cannot find any record for with Mary or Martin in with county, I have checked findmypast.ie, ancestry.com, rootsireland.ie and familysearch.org.

Any help would be greatly appreciated.