Garden Tractor Tire Spacer (update)

This is a bit of an odd thing to print, I admit.

A while back I changed my garden tractor's tires from turf tires to lug tires.
At first I simply installed the new tires on the original rims but was not all that impressed with them to be honest.
So then I decided that I needed a wider wheel base for more stability.
I tried to find spacers commercially but there was nothing that was direct fit, and things that could maybe be adapted were far too expensive and not locally available.
Then I