GM NOS 8998221 Catalytic Converter Fill Plug β€” 1975–1977 Buick, Chevy, Olds, Pontiac, Cadillac, GMC

$24.99

type: Unknown Type

Description:

GM PART 8998221 β€” SPECIFICATION & FITMENT CHART

πŸ“˜ Part Specifications

Attribute Details
GM Part Number 8998221
Description Catalytic Converter Fill Plug
Category Exhaust & Emissions β†’ Catalytic Converter Hardware
Material OEM‑grade metal plug
Condition NOS (New Old Stock)
Years Used 1975–1977
Notes Used to seal the catalytic converter fill port on early emissions‑era GM vehicles


πŸš— Vehicle Fitment (Verified OEM Coverage)

According to Oldsmobile Obsolete and eBay OEM listings, this plug fits nearly all GM divisions from 1975–1977.

Buick

  • 1975–1977 β€” All models

Cadillac

  • 1975–1977 β€” All models

Chevrolet

  • 1975–1977 β€” All passenger models

  • 1976 β€” Corvette

  • 1975–1977 β€” Blazer, Jimmy

GMC

  • 1976–1977 β€” Sprint

  • 1975–1977 β€” Full‑size trucks/SUVs

Oldsmobile

  • 1975–1977 β€” All models

  • Also listed for 1975–1976 Oldsmobile 455/500ci applications

Pontiac

  • 1975–1977 β€” All models