I think dbert has one and may know where some others are. He and Ronin are the big track machine experts here.
Toro 8/24 (38080) 1989
Toro 421-QZE (38585) 2008 (Gone)
Toro 721-QZR (38741) 2015 (Hemi Predator Power)
Experience is something you don't get until just after you need it.