Notes: 0.900.0100.9 COUNTERPLATE Diff. locking SP1.3 LD22121 is original SAME-DEUTZ-FAHR product. 0.900.0100.9 COUNTERPLATE Diff. locking SP1.3 LD221211 is commonly used in transmissions/axles/engines . if you have any questions please do not hesitate to contact us via Whatsapp +17275652849