I just happened to have a pair and tried them on the handbrake cable and have done nothing more with them, I did however ditch the AP's and have gone for mini R53 calipers. It may seem a retrograde step but if you do the numbers they are a good option. If I ever upgrade the TF again I would more thoroughly investigate the MX5 calipers.Thanks haven't heard anything about the Mazda MX5 calipers but could be interesting. As rebuilding the calipers are a right pain, Thanks for the help