These spring risers are made to offset the lowering from substituting an NB mount in place of an NA mount with the same spring length. When upgrading from OEM NA to NB shock mounts, the NB mounts will lower the car about 3/4" due to the spring mounting surface being higher up. If you want to upgrade to NB shock mounts to gain suspension travel, however keep your suspension geometry the way the factory intended it to be, you will need these risers.
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