Rocker Cover Set: Olds 403 Chrome Std HeightA new set of Chrome tin valve covers for the 403 Olds.. Supplied as a pair set ADD rocker cover gasketsif needed.: # PW15815 Standard height.. no good for Roller Rockers. 2. 5 inch high. Gaskets: Want to add the gaskets while your at it?? . there are two quality types.. the traditional cork.. or a longer lasting more forgiving flexible cork rubber compound. There is a price difference but the cork rubber type can be repeatedly used moreso then