Here's PDF from WFM that will help. It list all 100/200/300 series.
http://www.wfmfiles.com/download/70...&_Tractor_Interchangeability(dated_Nov74).pdf
Another for newer GTs
http://www.wfmfiles.com/download/11...&_Tractor_Interchangeability(dated_Feb04).pdf
http://www.wfmfiles.com/download/70...&_Tractor_Interchangeability(dated_Nov74).pdf
Another for newer GTs
http://www.wfmfiles.com/download/11...&_Tractor_Interchangeability(dated_Feb04).pdf