The Delta 34-976 Uniguard blade guard and splitter is a good choice for your Delta Contractor Saw or Unisaw (and works with some other brands).  There are similar and superior products out there (Excalibur by Sommerville Design, Biesemeyer, Exaktor, Brett Guard; search google for "Tablesaw Splitters and Blade Covers" for a review by Kelly Mehler), but the Uniguard  is very good for the price.  I have only minor complaints: no integrated dust collection (as in more expensive units), and it took longer to install and align than I expected.