I don't know any details, this is the first I looked into it. I do know that some were shipped out with problems and recalled, but that's all I know.
Let me know if you hear anything, thanks!The 2011 racks had issues with active nibble software. The 2012 and newer racks do not have the issue. But, if its not urgent, I would get the 302R rack. It has a calibration for slicks. I am waiting on Ford Performance inventory to be replenished myself.
I installed those limiters on my FR500 rack. There is something different in the racks though I can't tell you what that is. I know the difference between my stock GT rack and the FR500 rack was night and day and those are mechanically identical. Something that they tweak in there that makes the magic happen. I'll see if I can get some detail from Filip.I think the racks are mechanically identical but the ones for the wider tires have limiters installed similar to these from Roush.The Mustang Steering Rack Stops and Clamps Kit is a required part for 2005-2014 Mustangs using ROUSH® 20-Inch wheels. This steering rack kit properly spaces the wheels so that the larger front wheels don't hit the inner wheel wells. A Mustang using the 20-Inch wheels would require one Steering...www.roushperformance.com
But if you need them I'm sure you can fab some yourself.