GKTECH S/R CHASSIS REAR KNUCKLE REINFORCEMENT WELD IN KIT (Ball joint to strut mount brace only) (Order in)NOTE: This item is specially ordered from GKTECH Australia and usually takes around 3 4 weeks to arrive. Listing is for: 1x Pair of Ball joint to strut mount brace The GKTECH S R chassis rear knuckle reinforcement plates have been designed to brace the OEM rear knuckles where it needs it. If you've been drifting these cars for a while now, you would have seen the OEM cast knuckles break off on the balljoint mount and the toe arm mount, usually