Front upper control arm bolts?
 

Where are you all finding these knurled or serrated bolts at to go through the frame? Putting new springs on and they had used regular 1/2 bolts, but I don't see how you get a wrench on the backside to ever tighten them down. Hence the need for the special bolts I guess.

Or are you all just using regular bolts and the weight of the car keeps the bolt from spinning? A guy could get by with regular bolts but once everything is buttoned up and the wheels are on it seems like it will make it tough on the person who has to align the car and can't get to the bolt head.

I ordered a set online, but didn't pay much attention and they are for a GTO and are too small. They are a 7/16" bolt and I need 1/2"

Thanks

What happened to the original bolts? Can't you use them?

They were just standard 1/2” bolts with washers on them. Not the knurled type.

I found some through a guy on eBay.