I have been looking at the Delta Biesemeyer T-Square Anti-Kickback snap-in Splitter 78-961 for my Unisaw, but I see what appears to be two different styles being sold under the same part number. One style has a splitting blade that looks like a riving knife (it isn't). and the other appears to have just a small vertical rectangular blade. Anybody know why this splitter appears in two different configurations under the same model number? If you bought one, which model did you receive?