Well, the obvious answer is a MCSS or a Cutlass 442. However, many G bodies used these bars if they had the handling package. I think I got one of mine from a Grand Prix SJ and another from a Monte Carlo or Cutlass. There are several size differences depending on if it was a V6 or V8 car. The bigger front is a 1.25 in or 1.3 in bar, and is the same as a performance 3rd gen F body (IROC-Z, WS6, Z-28, Trans Am, Formula, etc.). The good rear is a .75in bar, and seems to have only come on V8 cars and Turbo Regals. If you want to go aftermarket, all of the major domestic suspension companies offer similar bars. I have a preference for Global West's products, but I am sure other companies offer good products as well. I would also try to get a steering box off of a performance G body at the same time as there is a huge difference in steering feel. It takes you from about 3.5 turns lock to lock to around 2.5 turns. Another thing to consider at this time is solid tie rod adjuster sleeves. They go for around $50, but with bigger tires they help take some of the flex out of the antiquated pitman arm steering linkage.