200x50mm Back Plates for Brake Drums Bolt On 2xPAIR Knott Ifor Williams Trailers. 200x50mm Back Plates for Brake Drums Bolt On PAIR Knott Ifor Williams Trailers. This high- quality pair of bolt- on backplate assemblies + Wheel Hub Nut M30x1.5 is specifically designed for trailers and horseboxes using Knott 200 x 50 mm Auto- Reverse brake drums, including Ifor Williams models manufactured after January 1996.
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