Looking for 3W 75 Pitts Exhaust. Not sure if 75i, 75i TS, 75i US, 75i US TS, or 75i QS. I believe that the center to center exhaust bolt measurements are the same. If not, let me know. New to gas motors. I can tell you that standing in front of the aircraft looking at the engine it is inverted, the exhaust port is on the left hand side, and the Pitts exhaust needs to hook to the right to stay under the cowling. Had right exhaust. Lost during last flight. Please call. 702-277-7630 Thank you.