BTW, I don't envy you having to do this install. The rear and trunk locations looks horrible to work in. Especially for someone like me who cant contort my body into small spaces like I used to.
I just finished an install this weekend on my brother's corvette and that car was equally as bad to work in. We ended up just removing all the seat to make enough room to work.
09 E90 M3 - Interlagos Blue / Black Novillo / Sycamore Anthracite / Eibach / HRE