Datsun 510 R-160 vs Subaru STi R-180 differential pinion flange

Internal splines are the same, but driveshaft bolt pattern is not. Newer nut includes a flange that elinates the need for a washer. Use loc-tite and 134 ft-lbs. Nut is crimped in 3 places, and is ideally single-use, but should be ok to reuse if you use loc-tite (red or blue).