JPP in conjunction with FAB81 Have modified knuckles based on a Japanese design. Not only do they give you crazy lock but they fix your ackerman angle, stop the rack from binding and stop the rack end for twisting at full lock!! In other words they are a must for anyone serious about drifting and at this price why wouldnt you. We will be selling these on an exchange basis and our kit will come with a 7mm slip on spacer and a 12mm bolt on spacer. Full instructions will be provided or we can fit them for you.