Spare parts for diesel engines

Spare parts for diesel engine
Hello! We are interested in spare parts for diesel engines, diesel generatorthemselves installation. Questions - spare parts are original =? who is the manufacturer? We are interested in brands such as MTU, Cummins, Caterpillar, Komatsu and other...... Just ORIGINAL!!!!! You are already supplied to Russia, what? I really hope for successful cooperation. Best regards