I work for a Toro dealer. Toro bought Wheel Horse and a lot of WH info has been lost over the years. (Last episode for me was trying to find bearings for a 38" deck with no model number.)
Your best bet is to measure a blade,(length, width, center hole diameter) or better yet, take one with you to a dealer. Lots of the WH blades are in the Aftermarket parts book, with dimensional data to match yours up.