Pete C. wrote:
That's expensive stuff for garden tractor wheel spacers. I'd be looking
to fab them out of steel and probably not a solid piece either, like two
disks of 1/2" plate with some turned tubular spacers between and welded.
The extra weight vs. AL would likely be a benefit for the application as
well.

I agree. Maybe even 1/4" steel, for ease of fab & wide spacers, to
resist the torque. Maybe 1-1/2" sch 40 pipe.

Bob