The lower hole
Hi. The lower hole closest to panrail is the feeder. It shuld be drilled out and tapped for an fitting. The hole directly above is the return line. It is plugged with a factory plug and is already threded.This hole is connected to the center hole that is the normal return to engine. Plug the center hole with a short appropriate bolt. There has to be some grinding done around the upper hole (return) to make room for the an fitting.but not much .There is plenty much material there so no worries.After this there is no using of any plates or stuff that comes with the relocationkit . I find they are not so reliable constructed .