i had the same problem when I put in a new transmission. I put the throwout bearing on anyway and just hoped for the best and thought it was normal and then realized after I put everything back together.... that was wrong. There's a sleeve that's about 4 or 5 inches long that slides onto the input shaft, then the throwout bearing slides over top of the sleeve.
now some clutch kits or parts stores will only sell the bearing and you will have to press it onto the old throw out sleeve.. but you should end up with a throw out bearing looking the SAME as the old one when it came off..
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