don't need eye bolts at all actually... here's mine. pm me if your interested in how to do it. look closely and you'll see what I did..
all you have to do it run thru into the trunk where the center of the spare tire cover (that carpeted part) is attached, and the one's on the outside's go in the corners of the back seats. just pull up the corners of the back seats.
FYI, I have the Sparco 4pt.