The GT-2500 was only made in 1981 and only had an 8-speed. The model number is 01-11B804. Couldn't find a picture of it but here's a 1982 GT-1142 it should be similar:
http://whtractor.15.forumer.com/index.php?showtopic=4815
You could also look on the Toro site parts breakdown under sheet metal for a rough idea. Here's the link;
https://lookup3.toro.com/partdex/index.cfm?xCaller=Toro
http://whtractor.15.forumer.com/index.php?showtopic=4815
You could also look on the Toro site parts breakdown under sheet metal for a rough idea. Here's the link;
https://lookup3.toro.com/partdex/index.cfm?xCaller=Toro