Are the 240z differential side flange shafts (with the center retaining bolt) 25, 27, or 29 spline?

Thanks

This picture is not the exact type as these show the C-clip retainer.

25 for the R180 and 29 for the R200. 27 spline is the Subaru WRX STi R180.

Thanks John. I'm working with a r160 from a subaru with 25 spline clutch pack. The flanges I'm looking for is can be found on a 240 - 280Z with a R180. Correct??

Thanks again.

Yes except the stamped steel shield is a different depth on the 240Z side axles. You cannot use the R160 side alxes on an R180 without cutting off that shield. The shield on the R180 side axles will sit about 3/8" away from the side seals when used in an R160.