Just look in the box for the nuts with the right size threads. Both have shoulders on them where they either contact the washer for the bushing or the lower control arm. Pay attention to which way you place the washers around the strut rod busing - it makes a difference, and it's not how you'd intuitively do it - you want the least amount of washer pressing on the bushing, so the curved side faces front, not surrounding the bushing. IIRC the nut at the lower control arm mount point is 3/4", the front one by the bushing is like 7/8".