Well I've got 3mm rack spacers and my hub steering arms are shortened by 1/2". I've not had any lock problems since and I've had to run 25mm spacers to help clear the wishbones
Rhdjapan.com expect to be paying out bucks though I'd look for someone on here that does their own custom stuff tbh
MPH customs do shortened hubs to improve lock.. or as said... rhd japan... uras? tie rods are about £170 delivered... i was looking about an hour ago!
Im also thinking of modding my knuckles, but are there any cons when doing that? The car will be streetdriven/trackdayed/drifted..