Here are some photos of the new vs old wheels. Went with 5" rubber/iron swivel wheels from Harbor Freight. These were the largest I could get and still maintain the same mounting assembly. Didn't want to pay for a bunch of mods as these have worked for the last 6 years on all types of surfaces to include mud, just needed a bit of butt behind them
this photo shows the delimination of the wheel material
this shows the height difference (approximately 1 ")
This is a good side view