^ This X 20,000.
Get it done by this site and never worry about it again. He got his start doing retrofits SPECIFICALLY with Subaru's and his quality of work, correspondence and customer care is second to none.
Do yourself a favor and go with them. The first time. Rather then buy some cheaper stuff, have a light go out while driving at night, get pissed off, and then wish you had gone there in the first place.