I just sold my friend my car to part out, which he sold the almost new (19k) s15diff, and s15turbo and turbomani and hks J-pipe for 1k. I slapped him in the face because, well you know why. Anyways, the s15diff uses the same axels as the s13, and as for the driveshaft, it’s the same. But if you are using a 6spd. Then you need a custom driveshaft for the s13, but if you have a s14 then you can use the s15 drive shaft. * I have a spare one for you s14 owners*. On the side note, I was very happy with the HLSD, for my new project, I WILL buy it again.