Can you take a better photo of the brackets?
EDIT:
Looking at your original K1 frame & the other (16v?) frame picture you bunged up, I'm wondering if K1 Tourings were done at dealer level with the original brackets ground off and a BMW supplied "kit" of bent up bracket, welding instructions & a tin of paint to turn K1s into Tourings??
The upper fairing mounts are the rubber grommet supported by the top-hat sleeve and a washer so that the grommet is in the sandwich.
Dave, IIRC, the washer allows the tube of the top-hat inside the hole.
That blind screw has me stumped.