I had always wondered how "traditional" front wheels could have centerlocks. It's fairly straightforward when the front is like the rear with a bolt from the inside and paired ball bearings, but haven't you wondered about the front?
I was able to obtain a set (the factory actually sold them that way in Weissach) of centerlocks for the car.
Here's the front: a modified (billet) hub with outside threads where the hub/grease cap would go, and a screw on cap with an integral stud for the centerlock.
Here's the hub without the cap so you can see the threads:
And here's the rear--just like seen on 964/993/996 racers from the factory, with a slightly different center bolt.
Once the bolt is torqued down, a "locking cone" fits into slots machined in a standard rear hub, keeping the bolt from coming loose when you remove the wheel.
More to come!