Just for clarity and you may well be aware of this but the rack is of a fixed length at each end is the track rod arm with a ball joint which is fixed to the rack, this ball joint centre should be transected by a line drawn down from the inner top wishbone mounting to the bottom wishbone mounting this correctly sets bump steer, this is the critical measurement, when that is correct you can lengthen or shorten the track rod end to fit the steering arm on the hub.
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