At the risk of looking like we are attempting to "steal away" here, we have been looking at offering our rear setup with bent frame rails for cars exactly as you describe: Pro-Street to Pro-Tour type conversions. There are a TON of these cars out there, in fact Penny was one example, we have several others including one coming in to the shop next week that have various guise's of frame modifications. To date, we have only had to modify our crossmembers to accomodate all of the configurations, but we have had requests for a kit with rails included.
If the rear frame rail kit from 21st is as nice as their front clips, I'd say buy it. The front stuff is very, very nice and went into Steve's car without too much fuss. I have not seen the other goods that they make in person, but they seem to have their act together, I'd bet a dollar that the rear stuff will work great for you.
Mark
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