i just started doing this exact thing. (2016 denali seats in a 08 sierra) the back seats bolted right in as everyone said before. & i will be starting on making custom brackets tomorrow out of stainless angle iron for front seats. i already got the power seats to work, & i plan on trying to utilize the covers from the 07-13 seats to hide the rails on the 2016 seats. i will also be attempting to put the 2016 center console in as well and also trying to get all the charging ports working properly. but i haven’t made it that far yet lol