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The UMI P/N 0058 heavy‑duty lower mount for 1978–1988 GM G‑Body replaces the factory clamshell and holds a Small Block Chevy in the exact factory location. It accepts UMI P/N 90051 solid lower mounts or factory rubber mounts and is built from 3/16" laser‑cut brackets with Grade 8 hardware. Solid mounts improve responsiveness and help with tight packaging but can increase noise, vibration and harshness.
UMI Performance 78-88 GM G-Body Engine Side Solid Engine Mounts
