the "real " ones were made from the early 260-289 valve covers, didn't have the flat spot where the breather is, the early motors were oiled thu the intake manifold, later engines thu the breather, depends on how 'real" you want to get. I got a set of the early rocker covers, but thems going on my car, the $500 is a good price if you ask me
289 FIA Valve Covers - Club Cobra Photo Gallery