Tillers

I have a FT 900 Tiller I purchased just over 1 year ago with less than 2 hours runt time. Both flanges that hold each of the  wheels are now all bent and contorted from the weight of the tiller. The steel is so soft these are easily bent by hand. I need these replaced with steel that will not bend under the weight of the tiller.

Are there replacements parts for these poorly tempered steel flanges? I have included an image of the bent flanges