It is part # 366300 according to the parts manual. There are 2 sets of mounting holes in the bottom of the seat. I have a brand new Gravely mower seat that came off a Zero Turn Mower model #915084.
One cut in side wall of one tire. Lots of Pictures, I can help Ship. Contact Corey - thank you Good Side walls, 20%+ tread, 16ply Forestry Tires. Used United 23.1x26 Skidder Tires * Two Used Tires 16ply Good Side walls, 20%+ tread