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This Supertech titanium retainer is made for SPR-TS1015 applications on Subaru STI engines that use an under-the-bucket shim recess; it is offered as a single retainer for the driver or secondary side as noted. The retainer provides the proper seating and compatibility for SPR-TS1015 springs in STI heads where the under-bucket shim arrangement is present during targeted valvetrain service.
Supertech Titanium Retainer for SPR-TS1015 Subaru STI (Under The Bucket Shim) - Single (D/S Only)
