Zoegrant , If your old throwout bearing was 1 & 7/8 "
in height . Why not get a GM NOS T.O. bearing .
There are quite a few on ebay right now . Since an NOS bearing
will be quite old it probably will need to be re-greased .
Go to ebay & type in the search box.......909422 .
photo@photobucket
http://i669.photobucket.com/albums/...Throwout_Bearing_909422__zpsmigxgnbo.jpg&
http://i669.photobucket.com/albums/..._Clutch_Release_Bearing__zps0ro81ft7.jpgGeorge
'54 3600