I have removed all the light covers, indicator and stop/brake.

All the covers are the same size, there are no reflectors.

I measured the set screws.
They seem to be 25.5mm, x 3.25mm, or switching to an imperial scale, 1" x 1/8". So are they BA threads or AF? I don't have an M3 set screw to try.

Anyone know for certain?

Peter,
66, 2016 Porsche Boxster S
No longer driving Tarka, the 2014 Plus 8...