Can anyone tell me if there is a record, and where it can be found, of the named and numbered grave plots in Braddon old and new burial grounds?

I was in the Isle of Man (from Cheshire) last week and searched in vain for my ggg grandparents burial plot. John Douglas died 1863 and Isabella Douglas died 1866. They lived at 36 Barrack Street, Douglas in 1861. I found other members of the family but not them. Thank you. Joan