So I picked up a T56 to swap into my car. It came with a Spec 3+ clutch to go with it. It was just thrown in for free so I wasn't concerned about condition. I have measured the thickness and ran it by Spec to make sure it had some life left. They should be 0.355" new and be replaced at 0.3". Mine came out to be 0.349" so it has plenty of life left. The problem though is that there is a purple-blue haze on the friction material towards the center. I wanted to know whether it would be usable or not, seeing as it might have been overheated.