I drew this sketch from a photo copied book I have, "The Complete Ray Kuns Auto Racing Book". Ford based midget spindles typically had these modifications and in addition to being shortened they also had the backing plate portion of the forging machined off. Kuns also mentions hubs, but details are sketchy.
As shown in the text- Front hubs are Model T machined to fit the spindles which, as previously explained, are converted Model A. When working the front hubs it is necessary to cut them off near the rear of the recessed portion of the hub and bore them out for installation of the race which carries the outer wheel hub bearing.
No mention of the particular hub used but I still believe they would be wooden wheel Model T. Also any modification to the Model A spindles is obviously adaptable to Early V8 spindles as well.