99% of Manx married by licence - the IoM has different rules than England - all these marriages at this period are in the parish reg thus should be in the IGI - the film of the official copy can be borrowed at any LDS fam hist centre (eg the one near the Albert Hall)

However at this period you are very unlikely to see parents named unless one party was under age - the witnesses might be useful.

99% of Manx records are on LDS films so readily researchable anywhere