This may or may not be them?!:

1861 Census IoM: RG_09_70_102; Rencell. Lonan: William Thompson, Head, Md, 63*, b.Scotland; Margaret H Thompson, Wife, Md, 60 b.Scotland.

Lonan Burials: THOMPSOM [sic] William, Rensell, 68*yrs…28 Jun 1861; No Will found

MI Lonan Old Yard B16: "In memory / of/ WILLIAM THOMPSON / of Edinburgh / Paper Maker, who departed this life / on the 26th of June 1861 / aged 68* years"

*?63? - definitely looks like 63 in Census Returns

Lonan Burials: THOMPSON Margaret, Dumbell's Row, Laxey Mines, 83yrs…25 Nov 1878 No MI No Will found

Their ages are slightly "out", but it looks like a possibility!