All B and D series clutch slave cylinders are the same. I have compaired my D16y5 one to my B18b1 slave cylinder and they are the same, even both have 3/4 cast into the front. However the clutch line are very different from the B and D engines. If doing a B series swap use the D16's clutch slave and lines, you may need to bend the lines just a bit for fitment.