The Willsons of Belfast Antrim Northern Ireland and Maguriesbridge Fermanagh County Northern Ireland

I am looking for any information regarding my Great-Great--Grandfather's parents, Joseph Willson--Born,1740
Hanover, Germany, Died on January 4th, 1826,Maguiresbridge, Fermanagh County, Northern Ireland and his beloved
wife, Elizabeth Schmuck--Born on September 23,1744, Hanover, Germany, Died on Maguiresbridge, Fermanagh County,
Northern Ireland. Joseph Willson took passage on board The Snow George bound from Belfast to Philadelphia in 1803.
I do not know where they are buried . In 1762 to 1768 they had settled in Belfast ,Northern Ireland before moving
in 1770 to Maguiresbridge, Fermanagh County, Northern Ireland.
Any help would be greatly appreciated.