There are many threads already existing on this subject. The center console is installed using a metal bracket that bolts to some of the holes in the floor designed for the middle seat. The Captain's chairs have armrests and thus a different frame from the regular outboard seats. (Not sure why they didn't just make one frame with a threaded hole for the armrest to save money, but they decided to make two different seat frames.) You would need to remove the armrests from your outboard seats in order to install a middle seat. This would leave a hole in each seat. The alternative is to replace the entire row. . .
