- these are similar to the kit I got -
https://www.ebay.co.uk/itm/CLASSIC-AND-KIT-CAR-GREEN-SUN-VISORS-UN-DRILLED-KIT-NEW/162650783128? as Dave points out, the important thing is to get them
un-drilled. You can then utilise the existing screws in the windscreen surround - so no drilling of holes needed

This works out at approx. half the price of Holdens ;more I guess if you factor in the perspex panels....
Masking tape on the perspex and take it nice and slow when drilling so that you don't crack the perspex
They also do the perspex in clear, smoked,blue and red - so no excuse for not matching the colour of your car.....

James