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They are collars to be used in conjunction with OEM bushings.
From Stance:
Scion FR-S / Subaru BRZ Subframe collars
Suspension feel is lost when road impurities are compensated by the subframe instead of the dampers. If the OEM rubber subframe bushings are still in good condition, these anodized aluminum subframe spacers are an excellent addition. These spacers reduce excess movement in the subframe that the OEM rubber bushings cannot account for. This results in a tighter subframe, offering the driver with ultimate contol of the car.
Also: lowered price.
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