The parts in question are the studs and nuts that join the exhaust to the headers. The studs are flat backed and pressed into the header flange, so you dont have to hold a wrench on them when threading tightening the nut. While this can make life a bit easier on and ideal job, if youre nuts seize its going to make your life a lot harder.
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HOLDEN RED MOTOR 6CYL STUDS & NUTS SET. Genie extractors-----2 years or 6 months on LPG. 6 x 3/8" UNC MANIFOLD STUDS - 2" LONG. 6 x 3/8" UNC STEEL NUTS. Nothing is impossible - mandrel bend, all degree bends, pre bent piping for all.