Layonnn said:Because grade 8 hardware isn't cheap, that is how it keeps the cost down.
Like I mentioned earlier. It doesn't keep the cost down if you have to source it anyways and its not really an optional accessory IMO. But whatever.
So after going to 3 hardware stores I found some grade 8 bolts. They only had 4 on the shelf ($26 for everything . I figure I'll use the grade 8 on the lowers and the grade 5 on the uppers.
Here is a pic of the 8 (left) OEM (center) and 5 (right) the 9/16 bolts are 4". The smooth part is ~2.25" on the OEM bolt and 2.125 (with washer as spacer) on the others. In the control arm the threads are even with the outside of the bushing so I don't anticipate any issues.

I plan on mounting them like this. Hopefully between the lock washer and locktite they will hold. I have had reports of them loosening even with locktite.

