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i might not need the steering linkage
No, you should not need the radius arms. But as said, getting them off the axle is gonna be a PITA unless you got a torch and an impact gun with you (and a nice deep socket that can swallow the coil mount stud). So you're probably better off taking them with the axle (most likely the yard will consider them as part of the whole axle assembly). Plus if you ever decide later to build a set of extended arms on your own, you'll already have a set on hand to practice with (or to build without having to tear your frontend all apart).