I have a clutch pedal assembly for sale. Originally, when I bought this assembly from another member I was told it was for a 1968. I could not get it to fit so I don't think that it is for a 68. Possibly a 1967? Not sure. Anyway attached is a picture, maybe you all could figure out if it will work for your application. I have taken off the spring that is shown in the picture which will be included. Also, the plastic bushing will have to be included. Asking $150. See picture below.
http://forums.stangnet.com/attachment.php?attachmentid=32646&d=1112758951
http://forums.stangnet.com/attachment.php?attachmentid=32646&d=1112758951