The bolt and that outer flange are 1 piece and I had the same problem, I couldn't budge the bolts. So I used a huge pair of channel-lock pliers, grabbed that flange and just turned the flange back and forth, then pried on it some with a pry bar, and more of the same til it worked it's way out. I ended up buying new spring pins (that's the OEM term for the bolts).

83 4x4, 3" Lift, 33" Buckshot Mudders