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You do not need a new holder to do this swap. The 52308-SNA-A01 holder is the same for all Civics.
That said, be aware the Si front lower arm is reinforced for the much heavier Ø28mm SVB bar. As mentioned, it is solid -compared to the hollow Ø24.2mm bar on the 4DR and Ø25.4mm bar on the base 2DR (also hollow). The Si lower arms have a gusset on the compliance bush collar, and a much thicker bracket for the stabi link to mount to.
Honda wouldn't make an Si exclusive lower arm if it wasn't necessary for durability.
I don't mean to complicate a clever mod idea, just a friendly 'heads up' for those considering it.
-SWRT
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