Help ID Rear wheel

I bought a 16 inch, mechanical brake drum, spoked rear wheel at a swap meet and I have no idea what it came off from, but I need a new sproket to put on it. Was wondering if anyone can identify it for me?

On the rim is stamped: MT 3.00X16 88--20 1325 11 80 DOT
On the hub is stamped: Kawasaki 1021
On the sproket I need is stamped: 276 - 33

I tried putting the sproket from my 1977 KZ 650 B on it and the center hole isn't the right diameter. Since I want to buy some bearings and new brakes for it, I kinda need to know what it came off from.
Thanks

Since you are going to replace the bearings anyway, knock one of them out and look at the number on it then post it here. That will narrow it down to just a few models.
It should be four numbers starting with a 3 and may end with one or two letters.