The J30 inner CV looks identical to the above photo. If you remove the dust cover and compress the CV boot, the bearings will pop out of the race. There are 6 bearings. I did not see a machined groove in the J30 axle. Maybe its only found on the Z32, I really dont know. The old boots were still good after ~20 years and they did not have that retaining clip. Anyway, I did not find it critical or compatible so I left it out.