I cut out the old rusted cups and welded a 2x3x12 inch rectangular tube in its place. The cradle then bolts to that tube instead of the cup. A lot of photos with this article. (NOTE - The link shows as a gas gauge, but it takes you to my cradle repair.)...
I know this is a couple years old, but mine just took longer to rust away. I was originally going to do the repair similar to how you did yours, but after I cut the old one away and started cleaning the surfaces, I stuck a 2x4 up there to see if the bottom of the frame was flat, thats when...