Hi, have an 04 sti drivetrain with 05 sti suspension components with 5x114 hubs. Right now my pain in the butt is front 05 sti struts with 99 Impreza strut mounts.
and the rear are 99 impreza struts (the bottom sleve bolts on to 5x114 hub carrier.) if you were to do 05 sti rear struts then you will need to figure something out and let me know lol. i'm pretty sure there is a "one best way" to address this with 05 sti parts. i just havent came around to it. (so if anyone is able to help us lol... ahem) other than that.
i recommend to sway over complete main engine harness with fuse boxes. and solder the door/window/sunroof/mirror harness from gc8 to the sti harness.