That mount looks like that bracket for the Hpipe, it stretched?
When I did my TSP Stainless Long Tubes I managed to relocate the front O2 Connectors far enough back along the Bell Housing to reach both Sensors on each side. It's tight but the wires are not taught, they are good. Rear Connectors I made plugs for similar to what you did, and turned them off in the tune.
The Steering Shaft I ran into the same, upon install I turned it down on the lathe to help but had slight rubbing on a right turn. When I had the Headers out of the car the last time for the Speed Bleeder install, I clearanced them with my air hammer. Nice .250" gap now, no issues.
🙂
Pic here was the before..
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