Help finding wheel

Y'all might remember I bought a parts Wheel Horse recently basically for tires and wheels. Well, my prize is going sour. The front tires were mounted on nice rims with un-inflated tubes. When trying to inflate them one valve stem tried hard to draw itself inside the rim and the other pushed out and since it was a 90deg stem it pushed hard into the wheel till I had to pry it away with a screwdriver to deflate it again. I had the tires demounted and found the tubes have the wrong type stems. I got in the truck to go get new rims and something reminded me I'd never actually checked to see if the rims would fit the axle on my Wheel Horse or Cadet. So I did and it doesn't. The axle length on the donor was 4.5 inches and my Wheel Horse was 3.75 inches and the cadet 3 inches! Bummer. After some measuring I found out that my Wheel Horse rims were the same width despite looking larger. So I could take those tires off and put these tires on. Great! So my neighbor and I using a tire changer he has demounted the tires and then noticed how badly rusted inside the rims were and they'd actually lost so much strength the'd bent during the demounting process. So Now I need new rims. The problem is I'm now aware how many variables exist in rims. Width, axle length, axle diameter, how far in or out the wheel bearing sits inside the wheel. I'd like to find a place online where I could buy the wheels at a good price but I can't find a place that gives all the needed info to insure I get what I need. Any ideas where I could find them?

List your dimensions on here and maybe somebody can help, I have quite a few that I have saved over the years.

I was getting measurements today and going to take a closeup photo or two when something else hit me. I'm planning on putting 12 X 5 rims on the back with AG tires instead of the 12 X 7 rims with turf tires. The rims have the same offset so the result will be will be the rear total width will be 4 inches narrower. So I need to see how that looks and if the front will look oddly wide--if so I might want to get a different offset for the rims since they need replacing now. I really need to get a better look at things before I go any further.

I have so much that needs doing to it. I have the transmission detached right now and the hitch needs repairing. This is only one of many stalled projects in a complicated life and I swear sometimes I feel like chucking everything and starting over but I keep hanging on because I want this stuff fixed. The tires and wheels were supposed to be a simple job but like many it has gotten complicated.

To top it off the Wheel Horse has been sitting for a couple years like this in a metal building and getting covered with mold. a week or so ago I needed to move a folded up tarp off something and I laid it on the hood of the tractor. Tonight I remove it and saw these puffy spots of yellowish white fuzz the size of pencil erasers all over the hood. I went to wipe them off and I guess it's some form of rust as the paint came right off too. And of all things at least this tractor had had a decent paint job.

I appreciate the offer and will get back to you one of these days--hopefully soon.