I know a few people that use 10mm spacers on a 20vt, but does anyone run a set of 15mm ones? If so then do you think they'll be any issues running them with a set of 17 inch wheels? They'll be hubcentric and with proper size bolts etc.

I run 20mm spacers and there fine, they dont scrape the wheelarch or lining.

Only thing i will say against them is they increase steering wheel vibration when going over rough/poor surfaces at high speed (every motorway in england basically).