Tires for '82 KZ 250

Overall, I'm wondering if these "universal" tires would fit my bike (subject line)?

This involves running tubes (spoked wheels) on a tubeless tire - would that work, or is that a newby mistake?

Also, where can I find a listing for my rim size?

Here.

www.powersportswarehouse.com/p/Kawasaki#...0-L1-1982/080104D-12

It's okay to use tubes w tubeless tires. Partzilla is another place that should have the tire sizes for your bike.
Or go to the dunlop motorcycle tire site. other tire mfgs may have a tire lookup by model as well.