As an owner of a 64 Chrysler NY, I can assure you that the 63-64 Mopar model years were not C bodies. That being said, it doesn't mean we can't help the guy. It's a common misnomer and I don't know that pointing it out only to not offer any help or support does anyone any good, but to each his own I suppose.
Additionally, any parts I have found from a 63 do fit my 64, so I suspect it may be the same for your Dodge 880's. In fact, I have bought some parts made for 63-64 Dodge 880's that fit my Chrysler NY. eBay has a Chrysler/Dodge interchangeable parts manual (albeit a reprint) for sale that might help you get started in the right direction as well.