Wheel cover locking package

Years 1967–72, 1983–85, 1987 Models 5 Factory citations 10

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Also described as Auxiliary fuel tank

Also documented for GMC

Documented applications

C/K Trucks

1967–72 Single-source

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Celebrity — A-body (1982–1990)

1984–1985, 1987 Factory-verified

Used with wire wheel covers; 1986 is not claimed: no dated page of that year prints the code; 1988 is not claimed: the 1988 page names N18 only inside the N91 entry

GM Heritage factory kit — 1984 Chevrolet Celebrity, p.42.
GM Heritage factory kit — 1985 Chevrolet Celebrity, p.43.
GM Heritage factory kit — 1987 Chevrolet Celebrity, p.42.

El Camino — fifth generation (1983–1987)

1983–1985 Factory-verified

Only with N95

GM Heritage factory kit — 1983 Chevrolet El Camino, p.7.
GM Heritage factory kit — 1984 Chevrolet El Camino, p.7.
GM Heritage factory kit — 1985 Chevrolet El Camino, p.12.

Malibu — fourth generation, A-body (1983)

1983 Factory-verified

requires N95

GM Heritage factory kit — 1983 Chevrolet Malibu, p.21.
GM Heritage factory kit — 1983 Chevrolet Malibu, p.23.

Monte Carlo — fourth generation (1983–1988)

1983–1984 Factory-verified

requires N95; the weight pages of the 1985–1987 kits still list it, but the guides from 1985 sell locking wire covers as N91

GM Heritage factory kit — 1983 Chevrolet Monte Carlo, p.30.
GM Heritage factory kit — 1984 Chevrolet Monte Carlo, p.36.

This page aggregates every documented appearance of N18 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.