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Sounds like you may have already got another regulator from a different year, but you might want to make sure you got a 99-01 regulator.
The 99-01 has auto up-down front windows, which the 97-98 does not have(only auto down driver's). Auto up windows require some extra circuitry that means the regulator is likely different. I am not totally sure on that since I am new to the Toyota/Lexus but it is a pretty safe bet.