I was Looking for brake cylinder stopper every where, because Cusco doesn't make it for 3rd gen STis.
Then found one from Beatrush, $85 shipped from Japan ($140 from JDM concept). Along with ss brakeline, brake feel is much firmer

Link: http://global.rakuten.com/en/store/laile/item/s36020db/

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MY08 STI 422whp at 1.5bar on E85, built by Diversion Garage, assembled and tuned by EvoR

Update from new owner: 375whp at 1.4bar on 98, at Tokyo Motorsport