If a part is temporarily unavailable, you could substitute it with these parts:
Quality Boot lock for Mercedes S-Class S 350 CDI 3.0 211 hp Diesel
Wide selection of new boot lock for Mercedes W221 S350CDI Diesel 211 hp, priced from £134.48 to £252.96. Choose from 7 trusted manufacturers.
Tailgate lock for MERCEDES-BENZ S-Class models
S 320 CDI (220.026, 220.126) OM 613.960
S 320 (220.065, 220.165) M 112.944
S 320 CDI (220.025, 220.125) OM 648.960
S 320 CDI (221.022, 221.122) OM 642.930
300 SE, SEL (126.024, 126.025) M 103.981
S 500 (220.075, 220.175, 220.875) M 113.960
280 SE, SEL (126.022, 126.023) M 110.989
300 SE, SEL/S320 (140.032, 140.033) M 104.990
CL 500 (215.375) M 113.960
S 500 (221.071, 221.171) M 273.961