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I have always been told that the 99' and up GSR came with leather stock. A guy i know has a 98 but has the cloth interior, mine is a 99' and i have leather, so i know it became standard at 99 or later.
I was thinking that too and also it would look odd if i had racing seats in the front made out of fabric and leather seats in the back, or if i take out the rear seats there will still be the leather trim on the doors.