On 8/14/2015 10:32 AM, Leon wrote:

That is entirely possible/likely. IIRC GM adopted the Torx in 1975.
Seat belt bolts were also some heavy duty applications of the Torx
screw. And for what that is worth, they may have been around earlier
than 1975 for GM however not for replacing the Phillips style screw. the
big deal back then was the better screw to replace the applications that
used Phillips screws.

Many of us leanred about torx when we went to replace a headlight. WTF
is this thing?