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The wires, as they come down into the tunnel area from their respective sides are as noted by Patches.
Re the fronts only; with stock exhaust manifolds it's close and fits great. When you install headers and O2 extensions you need to route the wires keeping them on the same side. Mine essentially went to the opposite side and turn back. As most headers have the bungs facing inwards, it's pretty much the only way.
The post-cat sensors cross over to the opposite side.