Here is a old post from the early days (Kubota tractors message board) that I thought was worth keeping along with the pic's. Looked like a good idea then and I think it still is.
Homemade Wheel Weights
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Kubota Tractors Message Board: Users Talk: Homemade Wheel Weights
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By gene on Sunday, December 20, 1998 - 04:56 pm:
Looks great Andy!
That is one of the best ideas I have seen for wheel weights.
Better go for a patent or Kubota will come out with it for 300.00 per wheel.
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By Andy on Sunday, December 20, 1998 - 03:19 pm:
I am enclosing some photos of the rear wheel weights I made for my B2400. The Mounting plates are 1/2" steel plate with 1/2" bolts welded on the back. The center mount for the weights is 1" threaded rod. The brackets can be left on the wheel all the time (although they are easy to remove) and the weights slide on and off quickly. The weights are 25 lb weight lifting weights that cost 39 cents a pound. The brackets weigh 15 lbs each, there are 6 weights on each wheel for a total of 330 lbs. Hope this works, it is my first try posting images.