Notes: 27231-500000 PLUG 50 is original JOHN-DEERE product. 27231-500000 PLUG 505 is commonly used in transmissions/axles/engines 3TNE78A-EHP, 3TNE78A-HP, 3TNE78A-KG2, 3TNE78A-MG, 3TNE82A-AF, . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849