Wow, DougT! You are some good! How many Vikings have you owned?
Just remember, even the blind squirrel finds an acorn once in a while. These wheels are particular to the model B which was the first Viking model built. These would have been built from 1926-34. I've got 2 fairly compete, unrestored w/reverser and a 3rd in pieces that needs wheels. Maybe it should be Andy's project? Here are some pictures of a model B I took on last year's west coast trip. It doesn't have the reverser.