First thing I did was the always HOT 12v mod. Just pop the hood and pull the relay/fuse box cover and locate the 12v plug relay. I just copied others and used a jumper to connect the 2 bypassing the relay. most used mod yet!
I'm not sure if I'm reading your question wrong, but it looks like you need #8 left and right side, if you need new rears then you would need two #9s since #9 is the same on left and right.