Your bike, being a motocross bike came with a slide in triangle style kickstand, that fits in the rear axle.
Due to it's age, the best you can do is buy a universal style stand and make it work, or try to adapt one from another bike. Unless by some chance you happen upon an NOS bolt on one meant specifically for your bike, but I doubt one was ever made. Good luck with it. Try some of the aftermarket parts sites, you might find something that you can make work.