Can't get the Leviton site to work for me.

I've just installed their 5225-WSP Combination Switch and Receptacle.
This is the older, non-Decora, style which fits a normal duplex outlet
wall plate. This item is a Grounding type, with the third hole in the
front. The house does not have grounding wires. In California, it is not
required to upgrade, but you can't use three-hole outlets unless
grounding is provided. Does anyone know the Leviton product line well
enough to know if they make a non-grounding version of this
switch/receptacle? Or, alternately, whether it is acceptable to plug the
third hole with . . . oh, I don't know . . . chewing gum or JB Weld or
suchlike?
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Mike "Rocket J Squirrel" Elliott
71 Type 2: the Wonderbus
84 Westphalia: "Mellow Yellow (The Electrical Banana)"
KG6RCR