They're for a G37, however when I purchased them some months ago the seller marketed them as being for the 370Z as well and I took his word instead of doing proper research. Anyway, because of the stock bracing on the Nismo (can't speak for the Base or Sport), there either wasn't room (for 3/4) or the holes didn't line up (the 6-point). When I actually took a closer look all the stickers on the braces said "G37" and I noticed the 6 point for the G37 has a different part number than the one for the Z.
As for where they go, I'll attach the manufacturer pictures of them actually mounted.
These are the exact ones I'm selling.