I do not know what the wheel weights are for. My dad got them some place & I do not remember them being used on anything.
The center has some hard porcelain type material that chiseled some out for lug bolt clearance. I guesstimate that they weigh between 25 to 30 pounds. The opening that are exposed when mounted I have thought about pouring melted lead into some of them to add more weight to them. The rear wheels have also been filled with windshield fluid. I had this set up on the LGT 100 last winter for plowing snow. When I got this tractor it seemed to be the best idea to put them on it.