Totally agree, I was not suggesting using flat standard N14 ones, they do not fit anyway... I've made that mistake before and will not do that again...
You can't tell from the link I posted but they are chamfered edges. proper GTIR ones I've got some here:
DSC_2088 by edward guest, on Flickr
I'm not saying Blue Print, ADL, Febi, etc. are one of the original Nissan OEM companies. But their parts are of the greatest quality, I'm yet to have anything from them that doesn't fit and feel quality:
http://www.bilsteingroup.com/uk/start.html
Only trouble with caster mod on any car is the added strain on other components etc. Admittedly a few degrees out of standard line will take years to manifest to a problem, so if you want fast road set up, do track days, etc then great, definitely go for it and enjoy it. Remember the knock on effect every modified part has on another...
Something I truly regret is not keeping my first gtir which was totally standard and keeping it that way, and learning how to drive it well