I bought something like that for a 2000 Chrysler LHS once. It worked great. It came with a key and you could turn the passenger side airbag on and off as needed. I found this thread where the guy did the same thing to his Porsche. Hope it helps.
Jeff
New Alternative to Porsche Passenger Airbag Deactivation Bar? - 986 Forum - for Porsche Boxster Owners and Others