I went with Solid Cs and knuckles on my build. Both the Cs and Knuckles needed grinding to clear the axle ears. The knuckles needed more than 1/4 inch of grinding each on their back sides to clear the brake calipers. That said, I don't regret my choice. I really like the way Solid (and Crane) machine large keyways into their knuckles to mate the arms up. Way better than relying on the shear strength of the steering arm studs to hold your arms on.
If you go Solid and have your ram mounted up high, I have a pair of Solid steering arms and caps here I couldn't use. Just an FYI.