Good luck! Been trying for over a year to get a wheel rate for the PST 1.03's. I'm sure it's probably somewhere between 230 and 250 lb/in as PST mentioned earlier in the thread, but personally I would bet they're a lot closer to 230 lb/in than they are 250. In fact, if I had to put money on it I'd say they probably are almost exactly 230 lb/in, given how their B body 1.03" bars are 209 lb/in and how those compare to FFI's published WR's for their 1" and 1.06" bars.
I gave up and bought a set of 1.06" Firm Feel bars for my GT. Yes, the FFI's are more expensive, but I have a couple sets from them already and they haven't let me down.