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I tried searching but couldn't find any information, and I don't always trust the internet. What size are the lugnuts on these generation LS's? (1996 LS400) I'm guessing 21mm. Is that right?
Mine are 21mm as well - 1991, with original lug nuts.
Measuring is always a safe bet. Unless you know they are the original lug nuts, there is always a chance that someone put aftermarket ones on that may be different.