Good morning Robertb, we do the front wishbones in flat section because it is much stronger, easier to weld with our pushrod set up, as we move the lower damper/pushrod mount position and, we think, it looks neater. Not sure of the weight advantage as our arms are different from the standard ones. If it is an aero advantage you are after, there are a lot better ways with a much better return than the aero wishbones, and from our experiments the damper will negate any advantage the flat wishbones will give. Must admit that our new kits will have aero pushrod arms, we would argue that because the dampers are not there it is an advantage, but we all know it's really because it looks the nuts.