You don't need to be a knowledgable mechanic Rob to see the calipers you have been supplied don't match the stub axle/brake disc combo with regard to mounting position. Futhermore it may, or should be, an MOT failure!
Richard
2018 Roadster 3.7 1966 Land Rover S2a 88 2024 Royal Enfield Guerrilla 450 1945 Guzzi Airone