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The spark plug wire loom fits into the top of the cap and is held into place by the coil. All 8 wires originate from the central loom making replacement of a single wire impossible. The hollow center area allows rotor contact to the coil via the spring in the center. As a byproduct, the thick loom insulates the coil from proper heat dissipation leading to potential problems. Back in 1983, the Unitized distributor spark plug wire harness had a list price of over $100 at a time when replacement points-type or HEI plug wires could be purchased from a local parts store for under $20.