Terrafirma 3º Caster Corrected Radius Arms This listing is for a set of heavy duty upgraded and caster corrected radius arms. Suitable for Defenders, Discovery 1 and Range Rover Classics with a 2-3" lift kit, and 44mm wide radius arm to axle bushes. When lifting the suspension on your vehicle, the steering angles are altered from their standard position. This can lead to vague steering and lack of self centering too. These arms are designed to return the axle back round 3º so the geometry sits back where it belongs. For vehicles lifted over 3" its recommended to use 6º corrected arms. These are suitable for vehicles with the wider 44mm bushes. These are designed to replace the following parts: NTC7331, NTC2694, LR041266 This .