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I had the same issue. Not sure if Nissan changed things but the holes in the plates are 13mm, the blind nuts, and therefore the bolts into the chassis, are 14mm.
Took mine to a local engineering shop and he milled the holes out for me, then I just sprayed a bit of paint on and all good.
PS. The engineer was VERY impressed with 3D's plates.
You may have one of the older ones theses fit about 6 different 4x4. just so the opposition that copies them I wont name them. They have since had 14.5 holes laser cut. just use a die grinder to take a piece of material out. try coming up with one product that fits 6 plus 4x4, sorry for inconvience. Also trying to cool down. Will double check with laser cutter in the morning
04 ST 3lt auto, not enough Mods to keep me happy, but getting there