Most other bars will be thicker and still rub, I have no specific knowledge of any that do not. Good spacers will cost a lot of money. There is still the steering stop option and those are a GM part.
The only problem with the rubbing is the shiny spots on the bar and in my case on the frame behind the a-arm. Mine has rubbed ocasionally for years and there is no damage to the tires. I put a lot of miles(86K in 3.5 years) on and use those tires and rims April thru October.
Why are you so worried about fixing it, just a damage concern, or is it something else?