Need movement/case ring for case type 827 Bulova MR556

Looking for a case ring MR556 I think for a case nbr 827. Bulova Sea King 11ANAC N0

Have tried eBay but no luck. As an alternative I’d be interested in a case and caseback and ring that would fit this movement and dial. 

Thanks

jay (levine98)

804.998.3519