Yes, this plate is 100% legit. I did not make these plates, however they were designed for me by a guy who makes/sells the plates.
They will bolt directly to any of the transmissions he has listed, with minor mods to the trans to keep everything lined up right.
This is his adapter on my 1991 vh45 bolted to a 08 350z trans(effectively a 370z trans)
OH and PS.
Yes its made in good ol USA right here in florida, I dealt with the guy who makes the plates personally and he is a super legit guy and more than willing to help if you have questions. Shoot him an email.