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I'm not using the stock upper spring perch on my RCE Tarmac 2's ... just the stock upper mount and conical washer. Zero problems so far. I'm imagining that with the COM C's you would just use Subaru OEM conical washer as well ... it's the only way you are going to get the proper rotation of the springs under load to avoid the whole spring bind / clunking ...
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2013 Scion FR-S Hot Lava 6MT Current Mods: KW V3 Coilovers - Raceseng CasCam Plates - Volk TE37SL Black Edition 18x9 +45 - Dunlop Direzza ZIIs 255/35 - Tomei Expreme Ti 60S - FT86 SpeedFactory UEL Catted Header
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