OK- I think what you want is the tube shaped bracket that mounts on the oil tank flange and supports the exhaust pipes, and there is a metal tab welded on...but that (I believe) is for the mixture, not the throttle.
The Cessna parts book illustrations for the engine (Fig.56) suck. The part you might be looking at is called BRACE ASSY EXHAUST STACK p/n 0450340-1 $1273.02
