⋯ Oh, and it was only two 10mm nuts to remove the motor. I accessed it from behind the drivers seat. I did not have to remove the seat but some people may. It wasn't the easiest access but not bad once you understand what you need to do and if you can lean far enough in to look under the seat.
Did my 2016 seat. Cable part # TK81-88-0D1 is correct. Got it from RealMazda parts.com. $24.00 shipped. Remove the 4 seat track bolts. Remove the rear first, move the seat back fully and disconnect the battery cable. While waiting remove the front bolts and tip the seat back. You can reach the cable to remove it. No need to remove the motor. Watch the video that yrwei52 posted. I pulled the new cable from the hsg. and put a very very small coating of grease on it and put it back in. Works great and don't take long.