Due to the age of this mobile home, will make it difficult to find insurance.
I have a 1980 mobile home that we use in a campground and we have it insured with State Farm. Granted mobile homes depreciate, but you still have an insurable interest, since you live there and have personal property and if it were to be destroyed, would need a place to live till repaired and/or totaled.
The reason the park wants you to insure it, is not only on the mobile home, but for liability also. If someone gets hurt in your home, then your insurance would cover it.
Since it is required to have, why not talk to your neighbors and ask them who insures their mobile homes? That is how we were able to find insurance for ours, since we asked other campers what insurance company they used. In my state, there are only 2 companies that will insure mobile homes and most likely in NY, may find that to be the same there.