we have an old Stieger tractor with a A model 3406 cat i need help with the exhaust elbow from the turbo to the exhaust flex pipe this has a circle clamp at the turbo extension and makes a 90 degree bend to a 4 bolt flange that bolts to the 4 bolt flange on the fles pipe i believe to be about 6" in diameter i can barely make out the numbers on the elbow maybe 517834 or 5I 7834 these are almost eroded to nothing thanks for the help chuck