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The HKS spherical collar (1790-HD018) is a replacement hardware component specified at 13L x 20 x 12.5 intended for use with HKS parts that call for this collar dimension. Offered as a single replacement piece, it helps restore correct spacing and alignment during repairs or rebuilds where the original HKS collar is needed.
HKS Collar Spherical 13Lx20x12.5 (1790-HD018)
