These are very cool parts, exact reproduction from an original part provided by Dieter at ANDIAL. We made them for a friend and I failed to make myself a set at the time, but I still have the tooling somewhere in my garage.

The Collier factory 914-6 GT has them installed, see here https://pbase.com/9146gt/image/89293018 and a closer look https://pbase.com/9146gt/image/89293011