Jake i see you read this http://www.ukstarlet...&id=2&record=19 and commented on the wiki. You will need spacers depending on the disc's you have, i have run on standard length studs for the last 18 months and have done a couple of track sessions on them. I run corrolla d4d discs that have to be machined down to fit PM Grant or Shorty as they have a disc set up that does not require the spacer at all John