Local gardaí confirmed that the items were brought ashore by fishermen about a mile offshore last Thursday 12 July.
The find comes more than nine months after a lifejacket and helmet believed to be from the downed Sikorsky S-92 helicopter washed up on a beach near Blacksod in Co Mayo.
It also comes 16 months after the tragedy that took the lives of four Irish Coast Guard personnel.
Capt Dara Fitzpatrick died shortly after she was recovered from the scene at Black Rock on 14 March 2017. The body of Capt Mark Duffy was recovered almost two weeks later.
Winch operator Paul Ormsby and winchman Ciaran Smith were lost at sea.
The Air Accident Investigation Unit’s probe of the incident remains ongoing.