these how tos have been done mayn times, i think the problem lies in the fact that "big" and "3" are too small and/or common of words to come up in the search engine reliably.
I've done iton both my Foci.
May 2014 ROTM, June 2015 ROTM
for auto-x: '04 Liquid Grey ZX3
Sold: '02 Infrared SVT