I bought both sides, couldn't get them to fit, then cut them up and replaced the rusted areas with the cut up pieces. Pretty expensive way to buy sheet metal. Live and learn. They reproduce more complex replacement parts than inner-to-outer panels that work just fine (like the right side louvered outer cowl), but nobody can stamp out an inner-to-outer cowl? Just about every restorer should probably replace these pieces. Seems like there would be a huge market for one that fits.
