"Will be ordering a 50.25mm piston soon" That'd be a wiseco.
FYI: I only use Suzuki pistons.
powersportswarehouse.com look up 2003 kawasaki KFS(kfx)80. Cheapest prices I've found.
I guess 2003 kawi piston interchange?
What about getting a bigger pistion? I'd rather not resleeve.