my opinion is the factory style repro harness that is tape wrapped is much preferable to the rod style harnesses that have exposed wires that are zip-tied, and the extra runs included aren't needed if you're not planning on things like electric rad fan or AC, electric windows, etc ... a number of folks here like the rod style ones tho
no extras required with the standard harnesses available, including shrink tubing, although where you custom fit length [mostly rear, left long for long beds, cut for short beds] it is a nice touch, easy to use
Bil
