If you look a the two Photos i just linked this is how your rear should look.....except your rear spring perch has more tension on the springs. (that was before i put in the rubber hat that is supposed to go up there)
The way i did it was measure from the top of the gold collar on the strut itself up to the gold mounting collar at the top and then match whatever number i got from there from side to side so both ended up even. It took a bit of back and forth but meh.
The issue i had with the BCs was i couldent drop just 1 inch, i had to slam it. Yea they are very adjustable....down to the road lol. My solution was to get a slightly longer spring in the rear and adjust the strut accordingly. I have yet to take pictures of that tho.
Now there is always the chance im horribly wrong...but the good thing about posting to a forum that if you are...SOMEONE will always be happy to tell you haha.
GL!