On the flavorizer bars, from what I've read, you can "get away with" only getting the 5 for the bottom row. Some say that it actually heats more evenly this way. One problem though is that Weber doesn't list the part number for the bars and I can't find it at Ereplacements or appliancefactoryparts either. Might be easiest just to contact Dave (RCPlanebuyer) and talk to him first. He might already have the measurements for the bars, or can tell you what needs to be done.