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Unfortunately, the RC records for Tullycorbet/Ballybay RC parish do not begin until 1862 so if Michael and Margaret were baptized and married in that parish, records will not be available. A search of the subscription site Roots Ireland did not locate a possible record. Civil registration did not begin until 1864.
I also looked in the Griffiths Valuation records from 1860-1861 but did not find a Francis Lennon or Leonard in either Tullycorbet or Ballybay civil parishes.
You may want to consider adding Michael and Margaret to our XO Chronicles site https://irelandxo.com/ireland-xo/history-and-genealogy/ancestor-database Possibly someone will see a connection.