What diameter torsion bars?

I was under the car today and noticed very little space between the torsion bar an the driver's side exhaust pipe. I measured it with a feeler gauge and it's only .116" which works with the current bar. It doesn't look like 1" bars will work. Doing the math I will only have .051" of space left unless I put a dent in the pipe that lines up with the torsion bar. A small dent to get some clearance would do it.