I don't know about used with solid lifters but the #1 rockers locate the rocker by something other than the valve tip (as #2 does), either guide plates or (more likely?) machined slots in the head that locate the pushrods as they pass through (like a small block chevy does).Most likely # 2. The rockers in the #1 pic are for solid lifter cams, which were not used in cougars.