I have a 2016 Z18 that came with the standard low back seats. I purchased the newer leather high back seats that came on 2017 and newer models and not sure how to install? The seats are flat and have two rows of screw holes. I saw a video where a metal plate gets mounted and then a metal mounting brackets gets attached to that which I assume screws to bottom of seats. No hardware came with the seats as they would have assumed they were for a 2017 or newer version and have the brackets already? Anyone have to go through this mounting process? Many Thanks