Whiteline Rear Anti Roll Bar - Adjustable - 20mm - Swift 1.3, 1.5 & 1.6 Sport ZC31Whiteline Rear Anti Roll Bar for Swift 1. 3, 1. 5 & 1. 6 Sport ZC31 20mm Adjustable 3 way Genuine Whiteline anti roll bars (sway bars) are supplied in our signature "Silver Sparkle II" metallic powder coat. Whiteline anti roll bars come complete with bushes and brackets where neccessary. Fensport Tip: The fitting of larger anti roll bars (rear and in general) has two main effects, vehicle balance in terms of understeer and oversteer, and increased