SYP500040 is superceeded by part Number LR015523 and is for RR L322 - All models from (VIN) 6A000001 on - Quantity Required - 2, on except 3.6L TDV8, 4.2L & 5.0L supercharged AJV8 & 4.4L TDV8 models
SJD000020 is for VIN up to 5A999999
So, it would helo if we knew what model year you have - the L322 runs from 2002 to 2013....