R180 R160 Differential Pinion Seal OEM 240Z 260Z 280Z 510New OEM Genuine Nissan rear differential pinion oil seal for R180 and R160 rear. This seal will fit most Datsun 240Z, 260Z, and 280Z, 1970 78 and all Datsun 510 1968 73. Some of the Z cars had the R200 differential or have been upgraded to the R200, so it will require a different seal. The quickest way to tell the difference in an R180 and an R200 is to look at the rear cover bolt pattern. Take a look at our rear cover gaskets to see the difference.