I know for a fact that the actual suspension of a spyder and a gs or rs is the same in terms of fitment. However, like you said, there is a slight difference in weight, so it uses different spring rates. But when lowering, that shouldn't be a real issue since all lowering springs are so much stiffer than stock anyways. It should be cool...

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2004 WRX - WR Blue Pearl
1997 Eclipse GS - Royal Sapphire Pearl