Once you go to the BD a-arms, you have to use their HD ball joints. They have a lighter duty ball joint for OEM a-arms but neither OEM or BD light duty ball joints work with the HD a-arms.
The tie rods are the same length regardless of application and do not need to be changed out. BD had a set of offset spacers which helped reduce tie rod binding, but I broke a couple of those and went back to not using them. I don't know if they have an improved set or whether they are still sold.
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