You've obviously not run into these, you lucky
fellow:
You and Gordon are right, I hadn't heard of Torx Plus or had the
misfortune to encounter any.
Sorry Jay for the OT car stuff, but it may be worth pointing out that VW
was also where I first saw those 12-lobe spline heads, where the bolt
head looks like the inside of a socket - that was on an '84 Passat. They
really don't want non-VW people opening things up.
That's not really a spline-head. It's triple-square. The cut angles
are 90-degrees. They're all over the place on my Audi. They use them,
not to make them difficult to remove by non-VAG personnel, but because
they are capable of taking a truly enormous amount of torque before
camming out. Makes them great for suspension and brake parts. You can
get a set of sockets for them for about $10.
Peace... Sridhar