Crap! Well, I measured it with a caliper. It was pretty rusty. I thought it was 5/16 or 3/8. Guess I was wrong all the way around.
I bought some used springs due to the fact I had a broken main on one side. After I've ordered bushings, shackle rebuild kit and now, another set of center bolts.
I'm wondering why I just didn't buy new springs.
