I searched and couldn't find an answer, I got eibach sporlines and when i put them on i know i'll need a camber kit. My question is that, i bought the stuff for the rear camber but they were 8.8 grade, not 10.9. and i dont want my shit to break, will i be allright? also how many washers can i add and still be safe?

Yes grade 8.8 will work. I've been using them for over two years. I used about 10-12 washers I think. It has over 2 yrs since I did it.

start with 5 washers on each bolt with one locknut, see how it is and then add or subrat washers, you will be fine with 8.8

Use a lot of washers =)
I used two rear camber spacers and 6 washers on top of that,
and I still have negative camber with the Sportlines.
-derek

Make sure you don't use too much because the bolt won't be long enough.