I'm looking at getting a sun visor from www.autocables.com.au, and was wondering how they are fitted, do I have to drill holes in the pillar/roof to mount it?
If anyone has one fitted could they let me know how its done because i probably wont buy one if it requires drilling into the body

See Datsun1200.com Wiki - Sun Visors.

I think they bolt onto the gutter. So you dont damage your original bodywork/paintwork!